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CVE-2026-31699
high
CVSS 7.1
Out-of-Bounds Write in c (CVE-2026-31699)
Summary
out-of-bounds write in c (CVE-2026-31699). Confidential information can be exposed externally.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31699** has been found in c.
Confidential information can be exposed externally. CVSS score: 7.1/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "c CVE-2026-31699" on the vendor's site.
CVE-2026-31699 (c) — CWE-787 / CVSS v3 7.1
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 7.1/10). Confidential information can be exposed externally
🔧 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
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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。
-
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/0fb87e44b81385f940b482cba5b3f0bd18fb8185
- web https://git.kernel.org/stable/c/111dcc6d0f016076745824a787d25609d0022f4c
- web https://git.kernel.org/stable/c/372116eece159adff631b1508344c8b85ebf9559
- web https://git.kernel.org/stable/c/3b4fd8f15765d9a3105b834dba8a05d025e5e16e
- web https://git.kernel.org/stable/c/502d10a1d9d477e6c7fc7021a2dac7018f4ab8b5
- web https://git.kernel.org/stable/c/59e9ae81f8670ccc780bc75f45a355736f640ec9
- web https://git.kernel.org/stable/c/607ba280f2adb5092cf5386c3935afac2ca0031a
- web https://git.kernel.org/stable/c/abe4a6d6f606113251868c2c4a06ba904bb41eed
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31699
- web https://github.com/advisories/GHSA-hwrp-qj75-rgxm