Loop with Unreachable Exit Condition ('Infinite Loop') Affecting python27:2.7/python2-pyyaml package, versions <0:3.12-16.module_el8.6.0+2781+fed64c13


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.32% (71st percentile)

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  • Snyk IDSNYK-ALMALINUX8-PYTHON27-5635275
  • published28 May 2023
  • disclosed9 Nov 2021

Introduced: 9 Nov 2021

CVE-2021-20270  (opens in a new tab)
CWE-835  (opens in a new tab)

How to fix?

Upgrade AlmaLinux:8 python27:2.7/python2-pyyaml to version 0:3.12-16.module_el8.6.0+2781+fed64c13 or higher.
This issue was patched in ALSA-2021:4151.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python27:2.7/python2-pyyaml package and not the python27:2.7/python2-pyyaml package as distributed by AlmaLinux. See How to fix? for AlmaLinux:8 relevant fixed versions and status.

An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.

CVSS Scores

version 3.1