What’s Vulnerable › Vulnerabilities

CVE-2026-43916: pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-12 · updated 2026-10-26
• Weakness: CWE-125

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.

Affected products

• identd-ng pam_authnft: before 0.2.0-alpha

References

• https://github.com/identd-ng/pam_authnft/pull/10
• https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh

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