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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXBxNjQtdjdmNS1ncWg4

Pygments vulnerable to Regular Expression Denial of Service (ReDoS)

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

Permalink: https://github.com/advisories/GHSA-pq64-v7f5-gqh8
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLXBxNjQtdjdmNS1ncWg4
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 3 years ago
Updated: about 1 month ago


CVSS Score: 7.5
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Identifiers: GHSA-pq64-v7f5-gqh8, CVE-2021-27291
References: Repository: https://github.com/pygments/pygments
Blast Radius: 36.4

Affected Packages

pypi:Pygments
Dependent packages: 1,834
Dependent repositories: 70,561
Downloads: 149,988,307 last month
Affected Version Ranges: >= 1.1, < 2.7.4
Fixed in: 2.7.4
All affected versions: 1.1.1, 1.2.1, 1.2.2, 1.3.1, 2.0.1, 2.0.2, 2.1.1, 2.1.2, 2.1.3, 2.2.0, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 2.4.2, 2.5.1, 2.5.2, 2.6.0, 2.6.1, 2.7.0, 2.7.1, 2.7.2, 2.7.3
All unaffected versions: 0.5.1, 0.7.1, 0.8.1, 0.11.1, 2.7.4, 2.8.0, 2.8.1, 2.9.0, 2.10.0, 2.11.0, 2.11.1, 2.11.2, 2.12.0, 2.13.0, 2.14.0, 2.15.0, 2.15.1, 2.16.0, 2.16.1, 2.17.0, 2.17.1, 2.17.2, 2.18.0