CVE-2026-4539

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 v3 3.3 LOW
CVSS v2.0 1.7 LOW

3.3^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.8 / Impact : 1.4

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope UNCHANGED

1.7^/10

CVSS v2.0 : LOW

Vector : AV:L/AC:L/Au:S/C:N/I:N/A:P

Exploitability : 3.1 / Impact : 2.9

Access Vector LOCAL

Access Complexity LOW

Authentication SINGLE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

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

Configurations

No configuration.

History

24 Apr 2026, 16:32

Type	Values Removed	Values Added
Summary		(es) Una falla de seguridad ha sido descubierta en pygments hasta la versión 2.19.2. El elemento afectado es la función AdlLexer del archivo pygments/lexers/archetype.py. La manipulación resulta en una complejidad ineficiente de la expresión regular. El ataque solo es posible con acceso local. El exploit ha sido publicado y puede ser utilizado para ataques. El proyecto fue informado del problema tempranamente a través de un informe de problema, pero aún no ha respondido.

22 Mar 2026, 06:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-22 06:16

Updated : 2026-04-29 01:00

NVD link : CVE-2026-4539

Mitre link : CVE-2026-4539

CVE.ORG link : CVE-2026-4539

JSON object : View

Products Affected

No product.

CWE

CWE-400

Uncontrolled Resource Consumption

CWE-1333

Inefficient Regular Expression Complexity

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