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CVE-2025-30355
Vulnerability in matrix-synapse (CVE-2025-30355)
Summary
vulnerability in matrix-synapse (CVE-2025-30355). Risk of unauthorized operations or information disclosure. Exploitable via ``depth``. Mitigation: upgrade to `1.127.1` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-30355** has been found in matrix-synapse.
Attackers can target a specific entry point like ``depth`` over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade matrix-synapse to **1.127.1** or later.
If unsure, ask your IT team or search "matrix-synapse CVE-2025-30355" on the vendor's site.
CVE-2025-30355 (matrix-synapse) — CWE-20 /
Attack vector: remote (network-reachable) / no user interaction
Attack surface: `depth`
Patched: `1.127.1` — apply immediately
Workaround: Closed federation environments of trusted servers or non-federating installations are not affected.
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-20) exists in matrix-synapse. Attackers reach the vulnerable code path via ``depth`` without authentication.
📍 Affected scope
matrix-synapse — . Attack surface: `depth`.
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **1.127.1**.
🛡️ Workaround
Workaround: Closed federation environments of trusted servers or non-federating installations are not affected.
🔍 Detection
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run `grep -r 'matrix-synapse' .` 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 'matrix-synapse' . | 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 `matrix-synapse` 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
Closed federation environments of trusted servers or non-federating installations are not affected.パッチが適用されるまでの応急処置として、Closed federation environments of trusted servers or non-federating installations are not affected. 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 matrix-synapse to 1.127.1ステージング環境で 1.127.1 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
PyPI
matrix-synapse
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.127.1"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2025-30355
- advisory https://github.com/advisories/GHSA-v56r-hwv5-mxg6
- package https://github.com/element-hq/synapse
- package https://pypi.org/project/matrix-synapse
- web https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6
- web https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389
- web https://github.com/element-hq/synapse/releases/tag/v1.127.1