{"id":"CVE-2025-61152","aliases":["DEBIAN-CVE-2025-61152","EUVD-2025-33725","GHSA-28pv-f4g7-364j","UBUNTU-CVE-2025-61152"],"status":"disputed","title":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any...","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation.","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-12","score":0.00323,"percentile":0.25681,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-269"],"published":"2025-10-10T00:00:00Z","modified":"2026-11-05T22:10:00Z","affected":[{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"python-jose","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"python-jose","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.0+dfsg-4"]}],"references":[{"url":"https://pypi.org/project/python-jose","tags":["report"]},{"url":"https://github.com/javiermorales36/PoC-for-python-jose-alg-none-JWT-bypass-vulnerability/blob/main/CVE-2025-61152_Security_Advisory.md","tags":["report"]},{"url":"https://github.com/mpdavis/python-jose/issues/391"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-61152"},{"url":"https://github.com/advisories/GHSA-28pv-f4g7-364j"},{"url":"https://security-tracker.debian.org/tracker/CVE-2025-61152","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2025-61152","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-61152","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2025-61152","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation.","status":"disputed","published":"2025-10-10T00:00:00Z","modified":"2025-11-25T17:09:56.14Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"adp"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T14:32:45.105469Z"}],"euvd":[{"id":"EUVD-2025-33725","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation.","status":"published","published":"2025-10-10T00:00:00Z","modified":"2025-11-25T17:09:56Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T19:49:12.807834Z"}],"ghsa":[{"id":"GHSA-28pv-f4g7-364j","title":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any...","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library.","status":"published","published":"2025-10-10T15:31:28Z","modified":"2025-11-25T18:33:27Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-269"],"updated_at":"2026-11-02T15:04:57.523321Z"}],"nvd":[{"id":"CVE-2025-61152","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation.","status":"disputed","published":"2025-10-10T14:15:43.36Z","modified":"2026-11-05T22:10:00.203Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-269"],"updated_at":"2026-11-05T23:57:15.690201Z"}],"osv":[{"id":"DEBIAN-CVE-2025-61152","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library.","status":"withdrawn","published":"2025-10-10T14:15:43.36Z","modified":"2025-11-25T13:50:43.640783Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:47.697959Z"},{"id":"UBUNTU-CVE-2025-61152","description":"python-jose thru 3.3.0 allows JWT tokens with 'alg=none' to be decoded and accepted without any cryptographic signature verification. A malicious actor can craft a forged token with arbitrary claims (e.g., is_admin=true) and bypass authentication checks, leading to privilege escalation or unauthorized access in applications that rely on python-jose for token validation. This issue is exploitable unless developers explicitly reject 'alg=none' tokens, which is not enforced by the library. NOTE: all parties agree that the issue is not relevant because it only occurs in a \"verify_signature\": False situation.","status":"published","published":"2025-10-10T14:15:00Z","modified":"2025-12-05T11:57:06.41422Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:55:50.817402Z"}]}}