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CVE-2026-4539

3.3 · LOW

A security flaw has been discovered in pygments up to 2.19.2.

Published Mar 22, 2026CWE-400EPSS 0.16%

Overview

CVE-2026-4539 is a low-severity vulnerability. It was published on March 22, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

A security flaw has been discovered in pygments up to 2.19.2. The impacted element is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation results in inefficient regular expression complexity. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

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/pygments/pygments/GitHubgithub.com/pygments/pygments/issues/3058Refvuldb.com/?ctiid.352327Refvuldb.com/?id.352327Refvuldb.com/?submit.774685

How CyberStrike helps

Frequently asked questions

What is CVE-2026-4539?

CVE-2026-4539 is a low-severity vulnerability. It was published on March 22, 2026 and has a CVSS 3.1 base score of 3.3 (LOW).

How severe is CVE-2026-4539?

This vulnerability has a CVSS 3.1 base score of 3.3, rated LOW. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-4539?

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-2026-4539?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-4539 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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