CVE-2026-32274
Black: Arbitrary file writes from unsanitized user input in cache file name
Description
Black is the uncompromising Python code formatter. Prior to 26.3.1, 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. Fixed in Black 26.3.1.
INFO
Published Date :
March 12, 2026, 8:16 p.m.
Last Modified :
March 18, 2026, 2:12 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Black to version 26.3.1.
- Avoid unsanitized --python-cell-magics values.
- Ensure proper file system access controls.
Public PoC/Exploit Available at Github
CVE-2026-32274 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-32274.
| URL | Resource |
|---|---|
| https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d | Patch |
| https://github.com/psf/black/pull/5038 | Issue Tracking Patch |
| https://github.com/psf/black/releases/tag/26.3.1 | Release Notes |
| https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-32274 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-32274
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
MVidarr - The Music Video Management System
HTML Python Shell JavaScript CSS TypeScript Batchfile Dockerfile Mako Go Template
Official website for Emelmujiro — AI education & consulting for enterprises
cloudflare-tunnel docker jwt nginx sqlite django react tailwindcss typescript vite
JavaScript Makefile Shell Dockerfile Python HTML CSS TypeScript
Open-source persistent memory for AI agent pipelines (LangGraph, CrewAI, AutoGen) and Claude. REST API + knowledge graph + autonomous consolidation.
mcp memory semantic-search vector-database claude vector-storage sqlite-vec mcp-server model-context-protocol agent-memory agentic-ai ai-agents autogen crewai knowledge-graph langgraph long-term-memory multi-agent open-source rag
Python Dockerfile Shell HTML Slim JavaScript Batchfile PowerShell CSS TypeScript
None
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-32274 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-32274 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 18, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:python:black:*:*:*:*:*:python:*:* versions up to (excluding) 26.3.1 Added Reference Type GitHub, Inc.: https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d Types: Patch Added Reference Type GitHub, Inc.: https://github.com/psf/black/pull/5038 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/psf/black/releases/tag/26.3.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m Types: Vendor Advisory -
New CVE Received by [email protected]
Mar. 12, 2026
Action Type Old Value New Value Added Description Black is the uncompromising Python code formatter. Prior to 26.3.1, 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. Fixed in Black 26.3.1. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-22 Added Reference https://github.com/psf/black/commit/4937fe6cf241139ddbfc16b0bdbb5b422798909d Added Reference https://github.com/psf/black/pull/5038 Added Reference https://github.com/psf/black/releases/tag/26.3.1 Added Reference https://github.com/psf/black/security/advisories/GHSA-3936-cmfr-pm3m