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CVE-2026-32274 high CVSS 7.5

Path Traversal in black (CVE-2026-32274)

Summary

Path traversal in black (CVE-2026-32274). Data can be tampered with by attackers. Mitigation: upgrade to 26.3.1 or later.

Original description

The description as published by the source.

Impact

Black writes a cache file, the name of which is computed from various formatting options. The value of the --python-cell-magics option was placed in the filename without sanitization, which allowed an attacker who controls the value of this argument to write cache files to arbitrary file system locations.

Patches

Fixed in Black 26.3.1.

Workarounds

Do not allow untrusted user input into the value of the --python-cell-magics option.

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-32274 has been found in black.
Data can be tampered with by attackers. CVSS score: 7.5/10.
What to do: upgrade black to 26.3.1 or later.
If unsure, ask your IT team or search "black CVE-2026-32274" on the vendor's site.

CVE-2026-32274 (black) — CWE-22 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Patched: 26.3.1 — apply immediately
Workaround: Do not allow untrusted user input into the value of the --python-cell-magics option.
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

Path traversal (CWE-22) exists in black.

📍 Affected scope

Check the vendor advisory for the affected versions of black.

🔥 Severity

Severity: High (CVSS 7.5/10). Data can be tampered with by attackers.

🔧 How to fix

Update to 26.3.1.

🛡️ Workaround

Workaround: Do not allow untrusted user input into the value of the --python-cell-magics option.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'black' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'black' . | 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 black を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply temporary workaround mitigate 
    Do not allow untrusted user input into the value of the `--python-cell-magics` option.

    パッチが適用されるまでの応急処置として、Do not allow untrusted user input into the value of the --python-cell-magics option. を実施。回避策の副作用 (機能低下) を確認した上で。

  3. 3
    Apply patch patch 
    Upgrade black to 26.3.1

    ステージング環境で 26.3.1 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を含めること。

  4. 4
    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。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip black
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.3.1"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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