{"id":"CVE-2026-43916","aliases":["EUVD-2026-29474","GHSA-5jj5-hm34-78vh","UBUNTU-CVE-2026-43916"],"status":"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.","severity":{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00263,"percentile":0.18267,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125","CWE-191"],"published":"2026-05-12T13:31:44Z","modified":"2026-10-28T02:30:48Z","products":[{"vendor":"identd-ng","product":"pam_authnft"}],"references":[{"url":"https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh","tags":["x_refsource_CONFIRM","advisory"]},{"url":"https://github.com/identd-ng/pam_authnft/pull/10","tags":["x_refsource_MISC","fix"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43916.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-43916","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-43916","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-43916","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-43916","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.","status":"published","published":"2026-05-12T13:31:44.359Z","modified":"2026-05-13T14:38:34.899Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high","assessor":"cna"}],"cwes":["CWE-125","CWE-191"],"updated_at":"2026-11-02T13:37:36.275898Z"}],"euvd":[{"id":"EUVD-2026-29474","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.","status":"published","published":"2026-05-12T13:31:44Z","modified":"2026-05-13T14:38:34Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T19:04:33.75998Z"}],"nvd":[{"id":"CVE-2026-43916","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.","status":"published","published":"2026-05-12T14:17:08.08Z","modified":"2026-10-26T18:10:00.173Z","cvss":[{"version":"4.0","score":8.7,"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"}],"cwes":["CWE-125","CWE-191"],"updated_at":"2026-11-02T14:12:18.613259Z"}],"osv":[{"id":"CVE-2026-43916","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.","status":"published","published":"2026-05-12T13:31:44.359Z","modified":"2026-10-28T02:30:48.794521851Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"cwes":["CWE-125","CWE-191"],"updated_at":"2026-11-02T15:45:04.820169Z"},{"id":"UBUNTU-CVE-2026-43916","description":"(pam_authnft is a PAM session module binding nftables firewall rules to ...)","status":"withdrawn","published":"2026-05-13T00:00:00Z","modified":"2026-05-20T16:26:04.504900788Z","cvss":[{"version":"4.0","score":8.7,"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","level":"high"}],"updated_at":"2026-11-02T16:56:22.075798Z"}]}}