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CVE-2026-53720
Vulnerability in pymonocypher (CVE-2026-53720)
Summary
vulnerability in pymonocypher (CVE-2026-53720). Risk of unauthorized operations or information disclosure. Mitigation: upgrade to `4.0.2.8` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-53720** has been found in pymonocypher.
Risk of unauthorized operations or information disclosure. CVSS score: ?/10.
What to do: upgrade pymonocypher to **4.0.2.8** or later.
If unsure, ask your IT team or search "pymonocypher CVE-2026-53720" on the vendor's site.
CVE-2026-53720 (pymonocypher) — CWE-122 /
Patched: `4.0.2.8` — 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-122) exists in pymonocypher.
📍 Affected scope
pymonocypher — .
🔥 Severity
Severity: ?. Risk of unauthorized operations or information disclosure
🔧 How to fix
Update to **4.0.2.8**.
🛡️ 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 'pymonocypher' .` 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 'pymonocypher' . | 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 `pymonocypher` 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 pymonocypher to 4.0.2.8ステージング環境で 4.0.2.8 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
pip
pymonocypher
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.2.8"}]}]
PyPI
pymonocypher
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.2.8"}]}]
References
- advisory https://github.com/advisories/GHSA-8f95-v3jq-cj86
- advisory https://nvd.nist.gov/vuln/detail/CVE-2026-53720
- package https://github.com/jetperch/pymonocypher
- package https://pypi.org/project/pymonocypher
- web https://github.com/jetperch/pymonocypher/security/advisories/GHSA-8f95-v3jq-cj86
- web https://github.com/jetperch/pymonocypher/commit/90ff5b13b13b5673c372e188f482d8c172e6ab86