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CVE-2026-4539

pygments archetype.py AdlLexer redos

CVSS 4.8 MEDIUMEPSS 0.2%CWE-1333CWE-400
Vexday Risk Score
13Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 4.8EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
22 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
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
Affected products
n/a · pygments

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References
https://github.com/pygments/pygments/https://github.com/pygments/pygments/issues/3058https://vuldb.com/?ctiid.352327https://vuldb.com/?id.352327https://vuldb.com/?submit.774685