{"id":"CVE-2026-18938","aliases":["AZL-95481","DEBIAN-CVE-2026-18938","EUVD-2026-54413","GHSA-6x8p-h5fj-5ppr","MGASA-2026-0460","OESA-2026-3503","ROOT-OS-DEBIAN-11-CVE-2026-18938","ROOT-OS-DEBIAN-12-CVE-2026-18938","ROOT-OS-DEBIAN-13-CVE-2026-18938","SUSE-SU-2026:24193-1","SUSE-SU-2026:24255-1","UBUNTU-CVE-2026-18938","USN-8687-1","openSUSE-SU-2026:11862-1","openSUSE-SU-2026:22105-1"],"status":"published","title":"P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nested attribute storage on 32 bit systems","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","severity":{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00107,"percentile":0.01141,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-122"],"published":"2026-08-07T08:19:08Z","modified":"2026-10-23T17:23:10Z","fixes":[{"ecosystem":"Azure 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4"}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-18938","tags":["vdb-entry","x_refsource_REDHAT","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2478995","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18938","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-6x8p-h5fj-5ppr"},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-18938","tags":["advisory"]},{"url":"https://advisories.mageia.org/MGASA-2026-0460.html","tags":["advisory"]},{"url":"https://bugs.mageia.org/show_bug.cgi?id=35906","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Q6TQ5QWOGE7ZBPZGVINQXHGKAYSV4IMF/","tags":["web"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2494556","tags":["report"]},{"url":"https://github.com/p11-glue/p11-kit/issues/767","tags":["report"]},{"url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AD5OWYEURQQ756QI27UWHAMDLD5B6WGZ/","tags":["web"]},{"url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3503","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624193-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1269664","tags":["report"]},{"url":"https://bugzilla.suse.com/1280702","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-13757","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-18938","tags":["web"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202624255-1/","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-18938","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-18938","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-8687-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-13757","tags":["report"]},{"url":"","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-18938","title":"P11-kit: integer overflow in rpc attribute-array length calculation can under-allocate nested attribute storage on 32 bit systems","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T08:19:08.239Z","modified":"2026-08-07T15:14:45.171Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"cna"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-54413","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T08:19:08Z","modified":"2026-08-07T15:14:45Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T18:02:07.294457Z"}],"ghsa":[{"id":"GHSA-6x8p-h5fj-5ppr","title":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC...","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T09:31:53Z","modified":"2026-08-07T09:32:04Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T15:10:11.041675Z"}],"nvd":[{"id":"CVE-2026-18938","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T09:16:58.67Z","modified":"2026-08-14T19:07:46.08Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-122"],"updated_at":"2026-11-02T14:12:35.386166Z"}],"osv":[{"id":"DEBIAN-CVE-2026-18938","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T09:16:58.67Z","modified":"2026-10-01T03:02:55.974352306Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:53.097669Z"},{"id":"OESA-2026-3503","title":"p11-kit security update","description":"Provides a way to load and enumerate PKCS#11 modules. Provides a standard configuration setup for installing PKCS#11 modules in such a way that they\u0026amp;apos;re discoverable. Also solves problems with coordinating the use of PKCS#11 by different components or libraries living in the same process.\r\n\r\nSecurity Fix(es):\n\nA flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.(CVE-2026-18938)","status":"published","published":"2026-08-30T04:14:19Z","modified":"2026-08-30T04:31:43.891547902Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:52:47.217107Z"},{"id":"UBUNTU-CVE-2026-18938","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T09:16:00Z","modified":"2026-08-31T17:15:59.961552552Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:01.334185Z"},{"id":"AZL-95481","title":"CVE-2026-18938 affecting package p11-kit for versions less than 0.26.5-1","description":"A flaw was found in p11-kit. A local attacker, or one with equivalent access to a reachable RPC channel, could exploit an integer overflow vulnerability. By sending specially crafted messages, the attacker can cause the system to miscalculate memory allocation for nested attributes. This leads to a memory corruption issue, specifically a heap out-of-bounds write, which can crash the p11-kit RPC parsing process, resulting in a Denial of Service (DoS). This vulnerability is only exploitable on 32 bit systems.","status":"published","published":"2026-08-07T09:16:58Z","modified":"2026-09-10T14:16:46.548118517Z","updated_at":"2026-11-02T15:28:12.028669Z"},{"id":"MGASA-2026-0460","title":"Updated p11-kit packages fix security vulnerabilities","description":"The updated packages fix security vulnerabilities:\nStack exhaustion via unbounded recursion in rpc attribute parsing.\n(CVE-2026-13757)\nInteger overflow in rpc attribute-array length calculation can\nunder-allocate nested attribute storage on 32 bit systems.\n(CVE-2026-18938)\n","status":"published","published":"2026-09-28T17:04:04Z","modified":"2026-09-28T17:15:03.548265441Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11862-1","title":"libp11-kit0-0.26.5-1.1 on GA media","description":"These are all security issues fixed in the libp11-kit0-0.26.5-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-09-23T00:00:00Z","modified":"2026-09-24T18:23:14.613114761Z","updated_at":"2026-11-02T16:58:40.245664Z"},{"id":"openSUSE-SU-2026:22105-1","title":"Security update for p11-kit","description":"This update for p11-kit fixes the following issues:\n\n- CVE-2026-13757: Stack exhaustion via unbounded recursion in RPC attribute parsing (bsc#1269664).\n- CVE-2026-18938: integer overflow in RPC attribute-array length calculation can under-allocate nested attribute storage\n  on 32 bit systems (bsc#1280702).\n","status":"published","published":"2026-10-15T12:14:52Z","modified":"2026-10-19T17:23:14.490501786Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2026-18938","title":"CVE-2026-18938 in p11-kit - Patched by Root","description":"Root has patched CVE-2026-18938 in the p11-kit package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-09-08T09:04:25Z","modified":"2026-09-08T10:15:03.050561466Z","updated_at":"2026-11-02T15:53:29.631993Z"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-18938","title":"CVE-2026-18938 in p11-kit - Patched by Root","description":"Root has patched CVE-2026-18938 in the p11-kit package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-09-08T07:03:18Z","modified":"2026-09-08T09:00:04.826930894Z","updated_at":"2026-11-02T15:53:31.773105Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-18938","title":"CVE-2026-18938 in p11-kit - Patched by Root","description":"Root has patched CVE-2026-18938 in the p11-kit package for Root:Debian:13. Multiple fixed versions available.","status":"published","published":"2026-09-08T08:57:38Z","modified":"2026-09-08T10:15:04.034361115Z","updated_at":"2026-11-02T15:53:33.153539Z"},{"id":"SUSE-SU-2026:24193-1","title":"Security update for p11-kit","description":"This update for p11-kit fixes the following issues:\n\n- CVE-2026-13757: Stack exhaustion via unbounded recursion in RPC attribute parsing (bsc#1269664).\n- CVE-2026-18938: integer overflow in RPC attribute-array length calculation can under-allocate nested attribute storage\n  on 32 bit systems (bsc#1280702).\n","status":"published","published":"2026-10-15T12:13:56Z","modified":"2026-10-21T17:23:08.918573975Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"SUSE-SU-2026:24255-1","title":"Security update for p11-kit","description":"This update for p11-kit fixes the following issues:\n\n- CVE-2026-13757: Stack exhaustion via unbounded recursion in RPC attribute parsing (bsc#1269664).\n- CVE-2026-18938: integer overflow in RPC attribute-array length calculation can under-allocate nested attribute storage\n  on 32 bit systems (bsc#1280702).\n","status":"published","published":"2026-10-15T12:13:56Z","modified":"2026-10-23T17:23:10.539413082Z","updated_at":"2026-11-02T15:54:04.519245Z"},{"id":"USN-8687-1","title":"p11-kit vulnerabilities","description":"It was discovered that p11-kit incorrectly handled certain RPC messages. A\nlocal attacker could use this issue to cause p11-kit to crash, resulting in\na denial of service. (CVE-2026-13757)\n\nIt was discovered that p11-kit incorrectly handled nested attribute\ndecoding on 32-bit systems. A local attacker could use this issue to cause\np11-kit to crash, resulting in a denial of service. (CVE-2026-18938)","status":"published","published":"2026-08-27T15:20:16Z","modified":"2026-08-31T17:26:23.914986011Z","updated_at":"2026-11-02T16:58:25.103481Z"}]}}