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CVE-2026-23879
high
CVSS 8.0
Vulnerability in py7zr (CVE-2026-23879)
Summary
vulnerability in py7zr (CVE-2026-23879). Successful exploitation can lead to full system takeover. Exploitable via ``py7zr``. Mitigation: upgrade to `1.1.3` or later.
AI summary snake-internal / snake-material-v2
A vulnerability tracked as **CVE-2026-23879** has been found in py7zr.
Attackers can target a specific entry point like ``py7zr`` over the network to misuse the product.
Successful exploitation can lead to full system takeover. CVSS score: 8.0/10.
What to do: upgrade py7zr to **1.1.3** or later.
If unsure, ask your IT team or search "py7zr CVE-2026-23879" on the vendor's site.
CVE-2026-23879 (py7zr) — CWE-59 / CVSS v3 8.0
Attack vector: remote (network-reachable)
Attack surface: `py7zr` / `extractall` / `output`
Patched: `1.1.3` — 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** (CWE-59) exists in py7zr. Attackers reach the vulnerable code path via ``py7zr`` without authentication.
📍 Affected scope
py7zr — . Attack surface: `py7zr` / `extractall` / `output`.
🔥 Severity
Severity: High (CVSS 8.0/10). Successful exploitation can lead to full system takeover
🔧 How to fix
Update to **1.1.3**.
🛡️ 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 'py7zr' .` 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 'py7zr' . | 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 `py7zr` 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 py7zr to 1.1.3ステージング環境で 1.1.3 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。
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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
py7zr
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.3"}]}]