Bug 2450066 (CVE-2026-4539) - CVE-2026-4539 pygments: Pygments: Denial of Service via inefficient regular expression processing in AdlLexer
Summary: CVE-2026-4539 pygments: Pygments: Denial of Service via inefficient regular e...
Keywords:
Status: NEW
Alias: CVE-2026-4539
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-03-22 06:01 UTC by OSIDB Bzimport
Modified: 2026-03-23 09:45 UTC (History)
73 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-03-22 06:01:42 UTC 
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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