CVE-2026-4539

LOW EPSS 5.2%

Published Mar 22, 20263mo ago · Modified Jun 17, 20262w ago

1.9 CVSS 4.0

Low

Published Mar 22, 2026 3mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

1.9

Exploitability

—

Impact

—

Vector string

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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector Local

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

5.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-1333

CWE-400 Uncontrolled Resource Consumption Resource Mgmt

References 5

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.