pygments up to 2.19.2 archetype.py AdlLexer redos

CVSS Meta Temp Score
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CTI Interest Score
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3.0$0-$5k0.55

Summaryinfo

A vulnerability has been found in pygments up to 2.19.2 and classified as problematic. This affects the function AdlLexer of the file pygments/lexers/archetype.py. This manipulation causes redos. This vulnerability is tracked as CVE-2026-4539. The attack is restricted to local execution. Moreover, an exploit is present. The project was informed of the problem early through an issue report but has not responded yet.

Detailsinfo

A vulnerability has been found in pygments up to 2.19.2 and classified as problematic. Affected by this vulnerability is the function AdlLexer of the file pygments/lexers/archetype.py. The manipulation with an unknown input leads to a redos vulnerability. The CWE definition for the vulnerability is CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. As an impact it is known to affect availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-4539. The exploitation appears to be easy. Attacking locally is a requirement. Technical details and also a public exploit are known. The attack technique deployed by this issue is T1449.003 according to MITRE ATT&CK.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The project was informed of the problem early through an issue report but has not responded yet. The vulnerability scanner Nessus provides a plugin with the ID 303303 (Linux Distros Unpatched Vulnerability : CVE-2026-4539), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (303303) and EUVD (EUVD-2026-14287). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 3.3
VulDB Meta Temp Score: 3.0

VulDB Base Score: 3.3
VulDB Temp Score: 3.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303303
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-4539

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

03/21/2026 Advisory disclosed
03/21/2026 +0 days VulDB entry created
03/22/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 3058
Status: Not defined

CVE: CVE-2026-4539 (🔒)
GCVE (CVE): GCVE-0-2026-4539
GCVE (VulDB): GCVE-100-352327
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/21/2026 10:15
Updated: 03/22/2026 22:53
Changes: 03/21/2026 10:15 (56), 03/22/2026 10:13 (1), 03/22/2026 22:53 (2)
Complete: 🔍
Submitter: ybdesire
Cache ID: 216:F3A:103

Submitinfo

Accepted

Be aware that VulDB is the high quality source for vulnerability data.

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