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Pygments has Regular Expression Denial of Service (ReDoS) due to Inefficient Regex for GUID Matching

🗓️ 22 Mar 2026 06:30:15Reported by GitHub Advisory DatabaseType 
github
 github🔗 github.com👁 5 Views

Pygments AdlLexer DoS in GUID regex; archetype.py affects up to 2.19.2; local access needed.

Related
Detection
Refs
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27 Apr 202607:44
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21 May 202614:46
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18 May 202616:50
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1 Jun 202611:47
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IBM Security Bulletins		Security Bulletin: IBM Maximo Application Suite - Monitor Component uses pygments-2.19.2-py3-none-any.whl which is vulnerable to CVE-2026-4539.
4 May 202606:57
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ATTACKERKB		CVE-2026-4539
22 Mar 202605:35
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Chainguard		CVE-2026-4539 vulnerabilities
29 Mar 202619:17
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Vulners
Node
pygmentspygmentsRange<2.20.0pip

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30 Mar 2026 14:40Current
5.4Medium risk
Vulners AI Score5.4
CVSS 21.7
CVSS 3.13.3
CVSS 44.8
CVSS 33.3
EPSS0.00007
SSVC
CWE-400CWE-1333
pygmentsadllexerglobally unique identifierarchetype fileregex slowdown
5