Vulnerability in libpython (CVE-2021-3426)

Summary

vulnerability in libpython (CVE-2021-3426). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3` or later.

AI summary snake-internal / snake-material-v2

A vulnerability tracked as **CVE-2021-3426** has been found in libpython. Risk of unauthorized operations or information disclosure. CVSS score: ?/10. What to do: upgrade libpython to **2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3** or later. If unsure, ask your IT team or search "libpython CVE-2021-3426" on the vendor's site.

CVE-2021-3426 (libpython) — Patched: `2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3` — 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** (unclassified) exists in libpython.

📍 Affected scope

libpython — .

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure

🔧 How to fix

Update to **2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3**.

🛡️ 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 'libpython' .` 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

1
Identify exposure identify
```
grep -r 'libpython' . | 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 `libpython` を grep し、稼働しているサービス・バージョンを把握する。
6
Apply patch patch
```
Upgrade libpython to 2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3
```
ステージング環境で 2.7.18, 3.6.13, 3.7.10, 3.8.8, 3.9.3 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。
7
Post-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

Bitnami libpython

[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.7.18"},{"introduced":"3.6.0"},{"fixed":"3.6.13"},{"introduced":"3.7.0"},{"fixed":"3.7.10"},{"introduced":"3.8.0"},{"fixed":"3.8.8"},{"introduced":"3.9.0"},{"fixed":"3.9.3"}]}]

Bitnami python-min

Bitnami python