CVE-2024-21503

MediumCVSS 5.3/10Last modified Jun 17, 2026

Description

Versions of the package black before 24.3.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the lines_with_leading_tabs_expanded function in the strings.py file. An attacker could exploit this vulnerability by crafting a malicious input that causes a denial of service. Exploiting this vulnerability is possible when running Black on untrusted input, or if you habitually put thousands of leading tab characters in your docstrings.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-1333CWE-75

Affected software

No affected versions have been published.

Timeline

Published
Mar 19, 2024
Last modified
Jun 17, 2026
NVD status
Deferred

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CVE-2024-21503: Medium severity, CVSS 5.3 | Vulnix