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CVE-2026-8466
Vulnerability in cowboy (CVE-2026-8466)
Summary
vulnerability in cowboy (CVE-2026-8466). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `2.15.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-8466** has been found in cowboy.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade cowboy to **2.15.0** or later.
If unsure, ask your IT team or search "cowboy CVE-2026-8466" on the vendor's site.
CVE-2026-8466 (cowboy) — CWE-770 /
Patched: `2.15.0` — apply immediately
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
**A vulnerability** (CWE-770) exists in cowboy.
📍 Affected scope
cowboy — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **2.15.0**.
🛡️ 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 'cowboy' .` 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 'cowboy' . | 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 `cowboy` を grep し、稼働しているサービス・バージョンを把握する。
-
6Apply patch patch
Upgrade cowboy to 2.15.0ステージング環境で 2.15.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスと、Step 3 で見つけた異常検知の続報チェックを含めること。
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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。
Affected packages
Hex
cowboy
[{"type":"SEMVER","events":[{"introduced":"2.0.0"},{"fixed":"2.15.0"}]}]
erlang
cowboy
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.15.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-8466
- package https://hex.pm/packages/cowboy
- package https://github.com/ninenines/cowboy
- web https://cna.erlef.org/cves/CVE-2026-8466.html
- web https://github.com/ninenines/cowboy/commit/5c6a2061b41bb5771c4659fac7d5a822dca5bafb
- web https://osv.dev/vulnerability/EEF-CVE-2026-8466
- web https://github.com/advisories/GHSA-jfc2-q6qh-g5x8