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.

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History

Mon, 23 Mar 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Low


Mon, 23 Mar 2026 10:00:00 +0000

Type Values Removed Values Added
First Time appeared Pygments
Pygments pygments
Vendors & Products Pygments
Pygments pygments

Sun, 22 Mar 2026 06:00:00 +0000

Type Values Removed Values Added
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.
Title pygments archetype.py AdlLexer redos
Weaknesses CWE-1333
CWE-400
References
Metrics cvssV2_0

{'score': 1.7, 'vector': 'AV:L/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:UR'}

cvssV3_0

{'score': 3.3, 'vector': 'CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:R'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-03-22T05:35:12.096Z

Reserved: 2026-03-21T09:10:23.929Z

Link: CVE-2026-4539

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-22T06:16:20.913

Modified: 2026-03-22T06:16:20.913

Link: CVE-2026-4539

cve-icon Redhat

Severity : Low

Publid Date: 2026-03-22T05:35:12Z

Links: CVE-2026-4539 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-03-23T09:46:37Z

Weaknesses