← Back
CVE-2026-34043
Vulnerability in serialize-javascript (CVE-2026-34043)
Summary
vulnerability in serialize-javascript (CVE-2026-34043). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `7.0.5` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-34043** has been found in serialize-javascript.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade serialize-javascript to **7.0.5** or later.
If unsure, ask your IT team or search "serialize-javascript CVE-2026-34043" on the vendor's site.
CVE-2026-34043 (serialize-javascript) — CWE-400 /
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `7.0.5` — 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-400) exists in serialize-javascript.
📍 Affected scope
serialize-javascript — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **7.0.5**.
🛡️ 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 'serialize-javascript' .` 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
-
1Identify exposure identify
grep -r 'serialize-javascript' . | 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 `serialize-javascript` 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 serialize-javascript to 7.0.5ステージング環境で 7.0.5 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。
-
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
serialize-javascript
[{"type":"SEMVER","events":[{"introduced":"5.0.0"},{"fixed":"7.0.5"}]}]
References
- advisory https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-qj8w-gfj5-8c6v
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-34043
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34043.json
- package https://github.com/yahoo/serialize-javascript
- patch https://github.com/yahoo/serialize-javascript/commit/f147e90269b58bb6e539cfdf3d0e20d6ad14204b
- web https://github.com/yahoo/serialize-javascript/releases/tag/v7.0.5
- web https://github.com/yahoo/serialize-javascript/releases/tag/v5.0.0
- web https://github.com/advisories/GHSA-qj8w-gfj5-8c6v