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CVE-2026-31696
high
CVSS 7.8
Out-of-Bounds Write in c (CVE-2026-31696)
Summary
out-of-bounds write in c (CVE-2026-31696). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31696** 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-2026-31696" on the vendor's site.
CVE-2026-31696 (c) — CWE-787 / 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
**out-of-bounds write** (CWE-787) 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/1fa36cf495b0023e8475d038535c05e4063211e1
- web https://git.kernel.org/stable/c/41a117dd80371343babc52198d1114e83eb37627
- web https://git.kernel.org/stable/c/4458757c020592a3094366e0fb20457383b42f92
- web https://git.kernel.org/stable/c/44714dfda386884919ba366411880b6fb3c3efd3
- web https://git.kernel.org/stable/c/9a397aa9b5e53ca63d4d6aefb542832eca389618
- web https://git.kernel.org/stable/c/a1be1c9ece26cea69654f28b255ff9a7906b897b
- web https://git.kernel.org/stable/c/ac33733b10b484d666f97688561670afd5861383
- web https://git.kernel.org/stable/c/ce383ba615339f8eaec646a166d2c2b015bb5ca0
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31696
- web https://github.com/advisories/GHSA-jrvq-m3v6-8wm9