{"id":"CVE-2026-43916","state":"PUBLISHED","title":"pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker","description":"pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha.","publishedAt":"2026-05-12T13:31:44.359Z","updatedAt":"2026-05-13T14:38:34.899Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["identd-ng pam_authnft"],"affected":[{"vendor":"identd-ng","product":"pam_authnft","versions":[{"version":"< 0.2.0-alpha","status":"affected"}]}],"references":["https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh","https://github.com/identd-ng/pam_authnft/pull/10"],"weaknesses":["CWE-125","CWE-191"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43916.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43916","state":"PUBLISHED","datePublished":"2026-05-12T13:31:44.359Z","dateUpdated":"2026-05-13T14:38:34.899Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-05-04T16:11:33.086Z"},"containers":{"cna":{"title":"pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker","descriptions":[{"lang":"en","value":"pam_authnft is a PAM session module binding nftables firewall rules to authenticated sessions via cgroupv2 inodes. Prior to 0.2.0-alpha, a heap buffer over-read in peer_lookup_tcp (src/peer_lookup.c:134, prior to the fix) allowed a crafted NETLINK_SOCK_DIAG reply to slip past the message-size check, then dereference past the end of the allocation. This vulnerability is fixed in 0.2.0-alpha."}],"affected":[{"vendor":"identd-ng","product":"pam_authnft","versions":[{"version":"< 0.2.0-alpha","status":"affected"}]}],"references":[{"url":"https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh","name":"https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/identd-ng/pam_authnft/pull/10","name":"https://github.com/identd-ng/pam_authnft/pull/10","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-191","lang":"en","description":"CWE-191: Integer Underflow (Wrap or Wraparound)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-12T13:31:44.359Z"},"source":{"advisory":"GHSA-5jj5-hm34-78vh","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T14:32:22.591683Z","id":"CVE-2026-43916","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-13T14:38:34.899Z"}}]}}}