Medium severity5.3OSV Advisory· Published Mar 19, 2024· Updated Apr 15, 2026
CVE-2024-21503
CVE-2024-21503
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
blackPyPI | < 24.3.0 | 24.3.0 |
Affected products
4- osv-coords3 versions
< 1.23.0-r12+ 2 more
- (no CPE)range: < 1.23.0-r12
- (no CPE)range: < 24.3.0
- (no CPE)range: < 24.3.0-150400.9.8.1
Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-fj7x-q9j7-g6q6ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2024-21503ghsaADVISORY
- github.com/psf/black/commit/f00093672628d212b8965a8993cee8bedf5fe9b8nvdWEB
- github.com/psf/black/releases/tag/24.3.0nvdWEB
- github.com/pypa/advisory-database/tree/main/vulns/black/PYSEC-2024-48.yamlghsaWEB
- security.snyk.io/vuln/SNYK-PYTHON-BLACK-6256273nvdWEB
News mentions
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