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CVE-2026-31396
high
CVSS 7.8
Use-After-Free in c (CVE-2026-31396)
Summary
vulnerability in c (CVE-2026-31396). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31396** has been found in c.
Successful exploitation can lead to full system takeover. CVSS score: 7.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "c CVE-2026-31396" on the vendor's site.
CVE-2026-31396 (c) — CWE-416 / CVSS v3 7.8
Attack vector: local / no user interaction
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.
❓ What is the problem
**use-after-free** (CWE-416) exists in c.
📍 Affected scope
c — .
🔥 Severity
Severity: High (CVSS 7.8/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to the patched release per vendor advisory.
🛡️ Workaround
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'c' .` against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response Actions (7 steps)
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'c' . | 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 `c` を grep し、稼働しているサービス・バージョンを把握する。
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7Post-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 Step 3 と同じログクエリでアラート再発が無いか継続監視。
References
- web https://git.kernel.org/stable/c/0bb848d8c64938024e45780f8032f1f67d3a3607
- web https://git.kernel.org/stable/c/1f4714065b2bcbb0a4013fd355b84b848e6cc345
- web https://git.kernel.org/stable/c/341d01087f821aa0f165fb1ffc8bfe4e50776da7
- web https://git.kernel.org/stable/c/5653af416a48f6c18f9626ae9df96f814f45ff34
- web https://git.kernel.org/stable/c/6b757f345eeea87ed5d8afd6de35b927a1a57a2f
- web https://git.kernel.org/stable/c/8820ffe0975fd2efbe50453e9179c8e1c33a13d3
- web https://git.kernel.org/stable/c/8da13e6d63c1a97f7302d342c89c4a56a55c7015
- web https://git.kernel.org/stable/c/eb652535e9ec795ef5c1078f7578eaaed755268b
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31396
- web https://github.com/advisories/GHSA-p6rr-6vhx-2g77