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CVE-2026-31494
high
CVSS 7.8
Out-of-Bounds Write in c (CVE-2026-31494)
Summary
out-of-bounds write in c (CVE-2026-31494). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31494** 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-2026-31494" on the vendor's site.
CVE-2026-31494 (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/240c5302eed83e34e98db18f6795ee5f40814024
- web https://git.kernel.org/stable/c/72d96e4e24bbefdcfbc68bdb9341a05d8f5cb6e5
- web https://git.kernel.org/stable/c/7ff87da099210856cbfe2f2f7f52ddfa57af4f0c
- web https://git.kernel.org/stable/c/95246341945163ad9a250a87ca5bd1c1252777ae
- web https://git.kernel.org/stable/c/9596759a84e1dbf2670518d85e969208960041f9
- web https://git.kernel.org/stable/c/9738be665544281aa624842812c2fbfed6f88226
- web https://git.kernel.org/stable/c/9d74d10e4e26672e139a8bcf8bf95957bf2d160f
- web https://git.kernel.org/stable/c/e182fe273cdf5a8931592228196ef514ffac392b
- web https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- web https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31494
- web https://github.com/advisories/GHSA-ww72-rr4h-c932