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CVE-2025-59420
Vulnerability in authlib (CVE-2025-59420)
Summary
vulnerability in authlib (CVE-2025-59420). Data can be tampered with by attackers. Exploitable via ``crit``. Mitigation: upgrade to `1.6.4` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2025-59420** has been found in authlib.
Attackers can target a specific entry point like ``crit`` over the network to misuse the product.
Data can be tampered with by attackers. CVSS score: ?/10.
What to do: upgrade authlib to **1.6.4** or later.
If unsure, ask your IT team or search "authlib CVE-2025-59420" on the vendor's site.
CVE-2025-59420 (authlib) — CWE-345 /
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: `crit` / `bork` / `cnf` / `jose`
Patched: `1.6.4` — 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-345) exists in authlib. Attackers reach the vulnerable code path via ``crit`` without authentication.
📍 Affected scope
authlib — . Attack surface: `crit` / `bork` / `cnf` / `jose`.
🔥 Severity
Severity: ?. Data can be tampered with by attackers
🔧 How to fix
Update to **1.6.4**.
🛡️ 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 'authlib' .` 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 'authlib' . | 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 `authlib` 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 authlib to 1.6.4ステージング環境で 1.6.4 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
authlib
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.4"}]}]
References
- advisory https://nvd.nist.gov/vuln/detail/CVE-2025-59420
- advisory https://github.com/advisories/GHSA-9ggr-2464-2j32
- package https://github.com/authlib/authlib
- package https://pypi.org/project/authlib
- web https://github.com/authlib/authlib/security/advisories/GHSA-9ggr-2464-2j32
- web https://github.com/authlib/authlib/commit/6b1813e4392eb7c168c276099ff7783b176479df
- web https://lists.debian.org/debian-lts-announce/2025/10/msg00032.html