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CVE-2026-8159
high
CVSS 7.5
Vulnerability in multiparty (CVE-2026-8159)
Summary
vulnerability in multiparty (CVE-2026-8159). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `4.3.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-8159** has been found in multiparty.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade multiparty to **4.3.0** or later.
If unsure, ask your IT team or search "multiparty CVE-2026-8159" on the vendor's site.
CVE-2026-8159 (multiparty) — CWE-1333 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `4.3.0` — apply immediately
Workaround: None.
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-1333) exists in multiparty.
📍 Affected scope
multiparty — .
🔥 Severity
Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.3.0**.
🛡️ Workaround
Workaround: None.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'multiparty' .` 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 'multiparty' . | 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 `multiparty` 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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5Apply temporary workaround mitigate
None.パッチが適用されるまでの応急処置として、None. を実施。回避策の副作用 (機能低下) を確認した上で。
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6Apply patch patch
Upgrade multiparty to 4.3.0ステージング環境で 4.3.0 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
npm
multiparty
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.3.0"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-8159
- package https://github.com/pillarjs/multiparty
- web https://cna.openjsf.org/security-advisories.html
- web https://github.com/pillarjs/multiparty/security/advisories/GHSA-65x3-rw7q-gx94
- web https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS
- web https://github.com/pillarjs/multiparty/releases/tag/v4.3.0
- web https://github.com/advisories/GHSA-65x3-rw7q-gx94