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CVE-2026-46209
high
CVSS 7.8
Out-of-Bounds Write in c (CVE-2026-46209)
Summary
out-of-bounds write in c (CVE-2026-46209). Successful exploitation can lead to full system takeover.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-46209** 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-2026-46209" on the vendor's site.
CVE-2026-46209 (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
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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/1a17ea9861e89585361caa8bc231bd22dc6dbe7d
- web https://git.kernel.org/stable/c/1da4ab7189f1064b3b712b388772c008b4d82580
- web https://git.kernel.org/stable/c/3d4c2268bd7243c3780fe32bf24ff876da272acf
- web https://git.kernel.org/stable/c/6b992591e04f2cce813bcf239b354f375bbf84d3
- web https://git.kernel.org/stable/c/c5fc49d8470c5ebf3b41607600f277158f159950
- web https://nvd.nist.gov/vuln/detail/CVE-2026-46209
- web https://github.com/advisories/GHSA-f8g6-g8cv-582v
- web https://git.kernel.org/stable/c/11427ad6c9f0def5ce567982b785da3191946430
- web https://git.kernel.org/stable/c/22922f7dae74409fc4bf0f1142710cb6b8ce8cc2
- web https://git.kernel.org/stable/c/adfc5ba4ef4dd2bca5969f40e8fc7b41fb3902ad