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CVE-2026-45736
medium
CVSS 4.4
Vulnerability in ws (CVE-2026-45736)
Summary
vulnerability in ws (CVE-2026-45736). Confidential information can be exposed externally. Exploitable via ``TypedArray``. Mitigation: upgrade to `8.20.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-45736** has been found in ws.
Attackers can target a specific entry point like ``TypedArray`` over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 4.4/10.
What to do: upgrade ws to **8.20.1** or later.
If unsure, ask your IT team or search "ws CVE-2026-45736" on the vendor's site.
CVE-2026-45736 (ws) — CWE-908 / CVSS v3 4.4
Attack vector: remote (network-reachable) / no user interaction
Attack surface: `TypedArray`
Patched: `8.20.1` — 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-908) exists in ws. Attackers reach the vulnerable code path via ``TypedArray`` without authentication.
📍 Affected scope
ws — . Attack surface: `TypedArray`.
🔥 Severity
Severity: Medium (CVSS 4.4/10). Confidential information can be exposed externally
🔧 How to fix
Update to **8.20.1**.
🛡️ 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 'ws' .` 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 'ws' . | 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 `ws` 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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6Apply patch patch
Upgrade ws to 8.20.1ステージング環境で 8.20.1 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
npm
ws
[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.20.1"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-45736
- exploit 134c704f-9b21-4f2e-91b3-4a467353bcc0
- package https://github.com/websockets/ws
- patch [email protected]
- web https://github.com/advisories/GHSA-58qx-3vcg-4xpx
- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
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- web 0b0ca135-0b70-47e7-9f44-1890c2a1c46c