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CVE-2026-31698
high
CVSS 7.1
Out-of-Bounds Write in c (CVE-2026-31698)
Summary
out-of-bounds write in c (CVE-2026-31698). Confidential information can be exposed externally.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-31698** 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-2026-31698" on the vendor's site.
CVE-2026-31698 (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。
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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/051e51aa55fd4cdc3e8283cf4476aeeb5f563274
- web https://git.kernel.org/stable/c/25d9b3446001185484209cf57951f3368462b631
- web https://git.kernel.org/stable/c/50808c13452dae43a2c90b1bbbf9daa16501ce70
- web https://git.kernel.org/stable/c/78b97e43d0b3e674d9d49ae56937b11e2ba3fcaf
- web https://git.kernel.org/stable/c/854d7846e1d29f32f1bbeb2e869e794df12067f6
- web https://git.kernel.org/stable/c/af67d35da744b6b678c7a0296d9c679658779829
- web https://git.kernel.org/stable/c/b5c14bd4da1f376f385722fe1da993f1edab6472
- web https://git.kernel.org/stable/c/e76239fed3cffd6d304d8ca3ce23984fd24f57d3
- web https://nvd.nist.gov/vuln/detail/CVE-2026-31698
- web https://github.com/advisories/GHSA-4j4q-vm37-787x