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.
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2021-27291US | high7.5 | — | ||
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 wors… | ||||
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references
External citations — patches, advisories, analysis.
- https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ceWEB
- https://github.com/advisories/GHSA-pq64-v7f5-gqh8ADVISORY
- https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14FIX
- https://lists.debian.org/debian-lts-announce/2021/03/msg00024.htmlWEB
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.htmlWEB
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.htmlWEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/WEB
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/WEB
scry
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