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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
identd-ng pam_authnft affected
Version Status Constraints
< 0.2.0-alpha affected —

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/identd-ng/pam_authnft/pull/10 cve-icon cve-icon
https://github.com/identd-ng/pam_authnft/security/advisories/GHSA-5jj5-hm34-78vh cve-icon cve-icon
History

Tue, 12 May 2026 14:00:00 +0000

Type Values Removed Values Added
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.
Title pam_authnft: Heap buffer overflow in NETLINK_SOCK_DIAG reply walker
Weaknesses CWE-125
CWE-191
References
Metrics cvssV4_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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-05-12T13:31:44.359Z

Reserved: 2026-05-04T16:11:33.086Z

Link: CVE-2026-43916

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-05-12T14:17:08.080

Modified: 2026-05-12T14:17:08.080

Link: CVE-2026-43916

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-12T16:00:13Z

Weaknesses