Out-of-Bounds Read in pam_authnft (CVE-2026-43916)
Summary
Vulnerability in pam_authnft (CVE-2026-43916). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to 0.2.0-alpha or later.
Original description
The description as published by the source.
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.
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-43916 has been found in pam_authnft.
Risk of unauthorized operations or information disclosure.
What to do: upgrade pam_authnft to 0.2.0-alpha or later.
If unsure, ask your IT team or search "pam_authnft CVE-2026-43916" on the vendor's site.
CVE-2026-43916 (pam_authnft) — CWE-125
Patched: 0.2.0-alpha — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
Out-of-bounds read (CWE-125) exists in pam_authnft.
Check the vendor advisory for the affected versions of pam_authnft.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 0.2.0-alpha.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'pam_authnft' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
grep -r 'pam_authnft' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
pam_authnftを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade pam_authnft to 0.2.0-alphaステージング環境で 0.2.0-alpha に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Ubuntu UBUNTU-CVE-2026-43916 pam
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov
- patch github.com