Inefficient Regular Expression Complexity Affecting python-pygments package, versions <0:2.2.0-22.module+el8.5.0+671+195e4563


Severity

Recommended
medium

Based on Rocky Linux security rating.

Threat Intelligence

EPSS
0.96% (84th percentile)

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  • Snyk IDSNYK-ROCKY8-PYTHONPYGMENTS-3202342
  • published5 Jan 2023
  • disclosed17 Mar 2021

Introduced: 17 Mar 2021

CVE-2021-27291  (opens in a new tab)
CWE-1333  (opens in a new tab)

How to fix?

Upgrade Rocky-Linux:8 python-pygments to version 0:2.2.0-22.module+el8.5.0+671+195e4563 or higher.
This issue was patched in RLSA-2021:4151.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-pygments package and not the python-pygments package as distributed by Rocky-Linux. See How to fix? for Rocky-Linux:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1