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CVE-2025-43866
Vulnerability in vantage6-server (CVE-2025-43866)
Summary
vulnerability in vantage6-server (CVE-2025-43866). Confidential information can be exposed externally. Mitigation: upgrade to `4.11.0` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-43866** has been found in vantage6-server.
Confidential information can be exposed externally. CVSS score: ?/10.
What to do: upgrade vantage6-server to **4.11.0** or later.
If unsure, ask your IT team or search "vantage6-server CVE-2025-43866" on the vendor's site.
CVE-2025-43866 (vantage6-server) — CWE-330 /
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: `4.11.0` — apply immediately
Workaround: You may define JWT secret key in the server configuration file
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-330) exists in vantage6-server.
📍 Affected scope
vantage6-server — .
🔥 Severity
Severity: ?. Confidential information can be exposed externally
🔧 How to fix
Update to **4.11.0**.
🛡️ Workaround
Workaround: You may define JWT secret key in the server configuration file
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'vantage6-server' .` 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 'vantage6-server' . | 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 `vantage6-server` 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
You may define JWT secret key in the server configuration fileパッチが適用されるまでの応急処置として、You may define JWT secret key in the server configuration file 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 vantage6-server to 4.11.0ステージング環境で 4.11.0 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
PyPI
vantage6-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.0"}]}]
pip
vantage6-server
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.11.0"}]}]
References
- advisory https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43866.json
- advisory https://nvd.nist.gov/vuln/detail/CVE-2025-43866
- package https://github.com/vantage6/vantage6
- web https://github.com/vantage6/vantage6/security/advisories/GHSA-m3mq-f375-5vgh
- web https://github.com/vantage6/vantage6/commit/e39a262faf1cd4c554bf1b8e57eeea082da995c0
- web https://github.com/pypa/advisory-database/tree/main/vulns/vantage6-server/PYSEC-2025-221.yaml
- web https://github.com/advisories/GHSA-m3mq-f375-5vgh