{"id":"CVE-2025-9820","aliases":["ALPINE-CVE-2025-9820","ALSA-2026:3477","ALSA-2026:4188","ALSA-2026:5585","AZL-75258","AZL-75261","BELL-CVE-2025-9820","CLSA-2026-1775224602","CLSA-2026-1780416707","DEBIAN-CVE-2025-9820","DLA-4492-1","EUVD-2025-206344","GHSA-337w-h8w7-m899","MGASA-2025-0317","OESA-2026-1043","OESA-2026-1044","OESA-2026-1045","OESA-2026-1046","OESA-2026-1417","RHSA-2026:3477","RHSA-2026:4188","RHSA-2026:5585","RHSA-2026:7477","RLSA-2026:3477","RLSA-2026:4188","RLSA-2026:5585","ROOT-OS-ALPINE-322-CVE-2025-9820","ROOT-OS-DEBIAN-12-CVE-2025-9820","SUSE-SU-2025:21202-1","SUSE-SU-2025:21222-1","SUSE-SU-2025:4271-1","SUSE-SU-2025:4272-1","SUSE-SU-2025:4323-1","SUSE-SU-2025:4346-1","SUSE-SU-2025:4525-1","SUSE-SU-2026:20962-1","SUSE-SU-2026:20968-1","SUSE-SU-2026:20984-1","SUSE-SU-2026:2367-1","UBUNTU-CVE-2025-9820","USN-8043-1","USN-8502-1","openSUSE-SU-2025:15765-1","openSUSE-SU-2026:20446-1"],"status":"published","title":"Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function","description":"A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.","severity":{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00222,"percentile":0.12921,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-121"],"published":"2025-11-25T00:00:00Z","modified":"2026-10-29T11:58:15Z","fixes":[{"ecosystem":"Alpine:v3.20","package":"gnutls","fixed_in":["3.8.12-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"gnutls","fixed_in":["3.8.12-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"gnutls","fixed_in":["3.8.12-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"gnutls","fixed_in":["3.8.11-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"gnutls","fixed_in":["3.8.11-r0"],"sources":["osv"]},{"ecosystem":"Azure Linux:2","package":"gnutls","fixed_in":["3.7.11-6"],"sources":["osv"]},{"ecosystem":"Azure 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The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.\r\n\r\nSecurity Fix(es):\n\n(CVE-2025-9820)","status":"published","published":"2026-01-09T11:10:05Z","modified":"2026-08-18T01:19:26.418098892Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:45.339366Z"},{"id":"OESA-2026-1417","title":"gnutls security update","description":"GnuTLS is a secure communications library implementing the SSL, TLS and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols as well as APIs to parse and write X.509, PKCS #12, and other required structures. The project strives to provide a secure communications back-end, simple to use and integrated with the rest of the base Linux libraries. A back-end designed to work and be secure out of the box, keeping the complexity of TLS and PKI out of application code.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.(CVE-2025-9820)","status":"published","published":"2026-02-13T11:10:26Z","modified":"2026-08-18T01:19:40.1855496Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:52:45.721983Z"},{"id":"RHSA-2026:3477","title":"Red Hat Security Advisory: gnutls security update","status":"published","published":"2026-03-03T10:24:48Z","modified":"2026-10-15T10:17:27Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:19.963895Z"},{"id":"RHSA-2026:4188","title":"Red Hat Security Advisory: gnutls security update","status":"published","published":"2026-03-11T10:11:59Z","modified":"2026-10-15T10:19:00Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:20.491441Z"},{"id":"RHSA-2026:5585","title":"Red Hat Security Advisory: gnutls security update","status":"published","published":"2026-03-25T10:15:01Z","modified":"2026-10-15T10:21:34Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:21.457353Z"},{"id":"RHSA-2026:7477","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-04-21T10:09:56Z","modified":"2026-10-15T10:26:55Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"RLSA-2026:3477","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.\n\nSecurity Fix(es):\n\n* gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n\n* gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-03-05T09:12:24.748134Z","modified":"2026-03-09T01:21:23.585126Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:25.804165Z"},{"id":"RLSA-2026:4188","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.\n\nSecurity Fix(es):\n\n* gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n\n* gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-03-11T12:05:01.163508Z","modified":"2026-03-23T04:52:40.867649Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"RLSA-2026:5585","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.\n\nSecurity Fix(es):\n\n* gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n\n* gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-04-07T00:00:52.228547Z","modified":"2026-04-07T00:31:07.62189Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:26.111232Z"},{"id":"ROOT-OS-ALPINE-322-CVE-2025-9820","title":"CVE-2025-9820 in rootio-gnutls - Patched by Root","description":"Root has patched CVE-2025-9820 in the rootio-gnutls package for Root:Alpine:3.22. Multiple fixed versions available.","status":"withdrawn","published":"2026-03-29T18:40:26Z","modified":"2026-10-09T13:00:08.416173401Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:28.544053Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2025-9820","title":"CVE-2025-9820 in rootio-gnutls28 - Patched by Root","description":"Root has patched CVE-2025-9820 in the rootio-gnutls28 package for Root:Debian:12. Multiple fixed versions available.","status":"withdrawn","published":"2026-05-04T06:45:52Z","modified":"2026-05-11T14:00:29.693242Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T15:53:31.773105Z"},{"id":"UBUNTU-CVE-2025-9820","description":"A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.","status":"published","published":"2026-01-26T20:16:00Z","modified":"2026-07-06T20:44:29.852110337Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T16:55:58.519486Z"},{"id":"ALSA-2026:3477","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.  \n\nSecurity Fix(es):  \n\n  * gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n  * gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-03-02T00:00:00Z","modified":"2026-10-29T11:58:15.120321Z","updated_at":"2026-11-02T15:27:54.283654Z"},{"id":"ALSA-2026:4188","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.  \n\nSecurity Fix(es):  \n\n  * gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n  * gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-03-10T00:00:00Z","modified":"2026-10-29T11:32:35.862160268Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"ALSA-2026:5585","title":"Moderate: gnutls security update","description":"The gnutls packages provide the GNU Transport Layer Security (GnuTLS) library, which implements cryptographic algorithms and protocols such as SSL, TLS, and DTLS.  \n\nSecurity Fix(es):  \n\n  * gnutls: Stack-based Buffer Overflow in gnutls_pkcs11_token_init() Function (CVE-2025-9820)\n  * gnutls: GnuTLS: Denial of Service via excessive resource consumption during certificate verification (CVE-2025-14831)\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":"2026-03-24T00:00:00Z","modified":"2026-10-29T11:02:29.010865013Z","updated_at":"2026-11-02T15:27:54.753319Z"},{"id":"AZL-75258","title":"CVE-2025-9820 affecting package gnutls for versions less than 3.7.11-6","description":"A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.","status":"published","published":"2026-01-26T20:16:09Z","modified":"2026-04-21T04:38:53.02561Z","updated_at":"2026-11-02T15:28:09.474476Z"},{"id":"AZL-75261","title":"CVE-2025-9820 affecting package gnutls for versions less than 3.8.3-8","description":"A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.","status":"published","published":"2026-01-26T20:16:09Z","modified":"2026-06-27T05:26:09Z","updated_at":"2026-11-02T15:28:09.474476Z"},{"id":"CLSA-2026-1775224602","title":"gnutls: Fix of CVE-2025-9820","description":"- CVE-2025-9820: fix stack-based buffer overflow in gnutls_pkcs11_token_init\n  when processing overly long PKCS#11 token labels","status":"published","published":"2026-04-03T13:56:46Z","modified":"2026-06-01T00:32:46.375118668Z","updated_at":"2026-11-02T15:43:44.009773Z"},{"id":"CLSA-2026-1780416707","title":"gnutls: Fix of 2 CVEs","description":"- CVE-2025-6395: harden TLS 1.3 handshake state handling around PSK binders\n- CVE-2025-9820: harden PKCS#11 token initialization against malformed input","status":"published","published":"2026-06-02T16:12:02Z","modified":"2026-10-26T09:30:16.68380095Z","updated_at":"2026-11-02T15:43:45.445699Z"},{"id":"DLA-4492-1","title":"gnutls28 - security update","status":"published","published":"2026-02-25T00:00:00Z","modified":"2026-02-25T10:30:38.640865Z","updated_at":"2026-11-02T15:46:12.7027Z"},{"id":"MGASA-2025-0317","title":"Updated gnutls packages fix security vulnerability","description":"Stack write buffer overflow. (CVE-2025-9820)\n","status":"published","published":"2025-12-04T23:29:13Z","modified":"2026-04-16T04:42:04.564847819Z","updated_at":"2026-11-02T15:49:43.178336Z"},{"id":"openSUSE-SU-2025:15765-1","title":"gnutls-3.8.11-1.1 on GA media","description":"These are all security issues fixed in the gnutls-3.8.11-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2025-11-25T00:00:00Z","modified":"2026-03-23T04:54:10.478986Z","updated_at":"2026-11-02T16:58:37.810934Z"},{"id":"openSUSE-SU-2026:20446-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-14831: Fixed DoS via excessive resource consumption during certificate verification. (bsc#1257960)\n- CVE-2025-9820: Fixed a buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n- Add the functionality to allow to specify the hash algorithm for the PSK. This fixes a bug in the current implementation where the binder is always calculated with SHA256. (bsc#1258083, jsc#PED-15752, jsc#PED-15753)\n","status":"published","published":"2026-03-30T14:36:07Z","modified":"2026-04-03T17:26:01.860036Z","updated_at":"2026-11-02T16:58:41.463445Z"},{"id":"SUSE-SU-2025:21202-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init (bsc#1254132).\n","status":"published","published":"2025-12-09T15:54:41Z","modified":"2026-03-23T04:51:15.629996Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:21222-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init (bsc#1254132).\n","status":"published","published":"2025-12-16T08:43:18Z","modified":"2026-03-23T04:51:17.090555Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:4271-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132) \n","status":"published","published":"2025-11-27T08:11:37Z","modified":"2026-02-04T02:36:36.635225Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:4272-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n","status":"published","published":"2025-11-27T08:11:48Z","modified":"2026-02-04T03:15:29.739565Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:4323-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n","status":"published","published":"2025-12-08T18:14:16Z","modified":"2025-12-09T14:34:20.204363Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:4346-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n","status":"published","published":"2025-12-10T10:39:49Z","modified":"2026-03-23T04:49:23.458433Z","updated_at":"2026-11-02T15:54:00.344164Z"},{"id":"SUSE-SU-2025:4525-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-9820: Fixed buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n","status":"published","published":"2025-12-26T12:19:11Z","modified":"2026-03-23T04:51:50.55828Z","updated_at":"2026-11-02T15:54:00.846737Z"},{"id":"SUSE-SU-2026:20962-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-14831: Fixed DoS via excessive resource consumption during certificate verification. (bsc#1257960)\n- CVE-2025-9820: Fixed a buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n- Add the functionality to allow to specify the hash algorithm for the PSK. This fixes a bug in the current implementation where the binder is always calculated with SHA256. (bsc#1258083, jsc#PED-15752, jsc#PED-15753)\n","status":"published","published":"2026-03-30T14:36:26Z","modified":"2026-04-09T18:24:27.705953Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:20968-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-14831: Fixed DoS via excessive resource consumption during certificate verification. (bsc#1257960)\n- CVE-2025-9820: Fixed a buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n- Add the functionality to allow to specify the hash algorithm for the PSK. This fixes a bug in the current implementation where the binder is always calculated with SHA256. (bsc#1258083, jsc#PED-15752, jsc#PED-15753)\n","status":"published","published":"2026-03-30T14:36:26Z","modified":"2026-04-09T18:24:37.707161Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:20984-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues:\n\n- CVE-2025-14831: Fixed DoS via excessive resource consumption during certificate verification. (bsc#1257960)\n- CVE-2025-9820: Fixed a buffer overflow in gnutls_pkcs11_token_init. (bsc#1254132)\n- Add the functionality to allow to specify the hash algorithm for the PSK. This fixes a bug in the current implementation where the binder is always calculated with SHA256. (bsc#1258083, jsc#PED-15752, jsc#PED-15753)\n","status":"published","published":"2026-03-30T14:36:26Z","modified":"2026-04-10T18:23:44.388027Z","updated_at":"2026-11-02T15:54:01.953589Z"},{"id":"SUSE-SU-2026:2367-1","title":"Security update for gnutls","description":"This update for gnutls fixes the following issues\n\n- CVE-2026-33845: buffers: switch from end_offset over to frag_length (bsc#1263704).\n- CVE-2026-33846: buffers: add more checks to DTLS reassembly (bsc#1263705).\n- CVE-2026-42009: lib/buffers: ensure packets have differing sequence numbers (bsc#1263708).\n","status":"published","published":"2026-06-11T09:12:50Z","modified":"2026-06-12T08:45:05.853886157Z","updated_at":"2026-11-02T15:54:03.991985Z"},{"id":"USN-8043-1","title":"gnutls28 vulnerabilities","description":"Tim Scheckenbach discovered that GnuTLS incorrectly handled malicious\ncertificates containing a large number of name constraints and subject\nalternative names. A remote attacker could possibly use this issue to\ncause GnuTLS to consume resources, resulting in a denial of service.\n(CVE-2025-14831)\n\nLuigino Camastra discovered that GnuTLS incorrectly handled certain PKCS11\ntoken labels. A remote attacker could use this issue to cause GnuTLS to\ncrash, resulting in a denial of service, or possibly execute arbitrary\ncode. The default compiler options for affected releases should reduce the\nvulnerability to a denial of service. (CVE-2025-9820)","status":"published","published":"2026-02-16T13:53:33Z","modified":"2026-04-27T18:38:58.231629Z","updated_at":"2026-11-02T16:58:22.951676Z"},{"id":"USN-8502-1","title":"gnutls28 vulnerabilities","description":"It was discovered that GnuTLS had a timing side-channel when processing\nmalformed ciphertexts in RSA-PSK ClientKeyExchange. A remote attacker\ncould possibly use this issue to recover sensitive information. This\nissue only affected Ubuntu 18.04 LTS. (CVE-2024-0553)\n\nBing Shi discovered that GnuTLS incorrectly handled decoding certain\nDER-encoded certificates. A remote attacker could possibly use this\nissue to cause GnuTLS to consume resources, leading to a denial of\nservice. This issue only affected Ubuntu 18.04 LTS. (CVE-2024-12243)\n\nLuigino Camastra discovered that GnuTLS incorrectly handled certain\nPKCS11 token labels. A remote attacker could use this issue to cause\nGnuTLS to crash, resulting in a denial of service, or possibly execute\narbitrary code. The default compiler options for affected releases\nshould reduce the vulnerability to a denial of service. (CVE-2025-9820)\n\nTim Scheckenbach discovered that GnuTLS incorrectly handled malicious\ncertificates containing a large number of name constraints and subject\nalternative names. A remote attacker could possibly use this issue to\ncause GnuTLS to consume resources, resulting in a denial of service.\nThis issue only affected Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.\n(CVE-2025-14831)\n\nOleh Konko and Joshua Rogers discovered that GnuTLS did not properly\nhandle case-insensitive name constraints in certain cases. A remote\nattacker could possibly use this issue to bypass certificate validation,\nleading to a machine-in-the-middle attack. (CVE-2026-3833)\n\nJoshua Rogers discovered that GnuTLS did not properly handle very short\npremaster secrets in certain RSA key exchange cases with PKCS#11-backed\nserver keys. A remote attacker could possibly use this issue to obtain\nsensitive information. This issue only affected Ubuntu 18.04 LTS and\nUbuntu 20.04 LTS. (CVE-2026-5260)\n\nJoshua Rogers discovered that GnuTLS did not properly handle malformed\nDTLS handshake fragments in certain cases. A remote attacker could\npossibly use this issue to obtain sensitive information, or cause a\ndenial of service. This issue only affected Ubuntu 20.04 LTS.\n(CVE-2026-33845)\n\nHaruto Kimura, Oscar Reparaz, and Zou Dikai discovered that GnuTLS did\nnot properly validate DTLS handshake fragment lengths in certain cases.\nA remote attacker could possibly use this issue to cause GnuTLS to\ncrash, resulting in a denial of service, or execute arbitrary code.\n(CVE-2026-33846)\n\nJoshua Rogers discovered that GnuTLS did not properly order DTLS packets\nwith duplicate sequence numbers in certain cases. A remote attacker\ncould possibly use this issue to cause GnuTLS to crash, resulting in a\ndenial of service. (CVE-2026-42009)\n\nJoshua Rogers discovered that GnuTLS did not properly handle usernames\ncontaining NUL characters in certain RSA-PSK configurations. A remote\nattacker could possibly use this issue to bypass authentication and gain\nunintended access to services. This issue only affected Ubuntu 20.04\nLTS. (CVE-2026-42010)","status":"published","published":"2026-07-06T13:37:09Z","modified":"2026-07-06T20:44:29.015957909Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}