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CVE-2024-21503

5.3 · MEDIUM

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.

Published Mar 19, 2024CWE-1333EPSS 0.98%

Overview

CVE-2024-21503 is a medium-severity vulnerability. It was published on March 19, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/psf/black/commit/f00093672628d212b8965a8993cee8bedf5fe9b8GitHubgithub.com/psf/black/releases/tag/24.3.0Refsecurity.snyk.io/vuln/SNYK-PYTHON-BLACK-6256273GitHubgithub.com/psf/black/commit/f00093672628d212b8965a8993cee8bedf5fe9b8GitHubgithub.com/psf/black/releases/tag/24.3.0Refsecurity.snyk.io/vuln/SNYK-PYTHON-BLACK-6256273

How CyberStrike helps

Frequently asked questions

What is CVE-2024-21503?

CVE-2024-21503 is a medium-severity vulnerability. It was published on March 19, 2024 and has a CVSS 3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2024-21503?

This vulnerability has a CVSS 3.1 base score of 5.3, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2024-21503?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2024-21503?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-21503 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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