CVE-2021-27291: Pygments vulnerable to Regular Expression Denial of Service (ReDoS)
(updated )
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.
References
- gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce
- github.com/advisories/GHSA-pq64-v7f5-gqh8
- github.com/pygments/pygments
- github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
- github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml
- lists.debian.org/debian-lts-announce/2021/03/msg00024.html
- lists.debian.org/debian-lts-announce/2021/05/msg00003.html
- lists.debian.org/debian-lts-announce/2021/05/msg00006.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ
- nvd.nist.gov/vuln/detail/CVE-2021-27291
- www.debian.org/security/2021/dsa-4878
- www.debian.org/security/2021/dsa-4889
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