CVE-2026-4539 | pygments up to 2.19.2 archetype.py AdlLexer redos (Issue 3058)

VDB-352327 · CVE-2026-4539 · ISSUE 3058 PYGMENTS UP TO 2.19.2 ARCHETYPE.PY ADLLEXER REDOS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.0 $0-$5k 2.14+ 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. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Name pygments Version 2.19.0 2.19.1 2.19.2 Website Product: https://github.com/pygments/pygments/ 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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: 🔒 Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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 03/21/2026 +0 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 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/21/2026 10:15 Changes: 03/21/2026 10:15 (56) Complete: 🔍 Submitter: ybdesire Cache ID: 99:81D:101 Submitinfo Accepted Submit #774685: pygments <=2.19.2 Denial of Service (by ybdesire) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸