PYSEC-2021-141

At a glance

Published: 2021-03-17 13:15 UTC
Updated: 2023-11-08 04:05 UTC
CVE: CVE-2021-27291
Aliases: GHSA-pq64-v7f5-gqh8

Description

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.

Affected packages

Package	Versions
PyPI · pygments	introduced 0, fixed 2e7e8c4a7b318f4032493773732754e418279a14 ; introduced 1.1, fixed 2.7.4

References

https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce WEB
https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 FIX
https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html WEB
https://www.debian.org/security/2021/dsa-4878 ADVISORY
https://www.debian.org/security/2021/dsa-4889 ADVISORY
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ WEB
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ WEB
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html WEB
https://github.com/advisories/GHSA-pq64-v7f5-gqh8 ADVISORY

Sources

Source	Licence
OSV.dev	CC-BY 4.0 — PyPA Advisory Database