GHSA-pq64-v7f5-gqh8
Pygments vulnerable to Regular Expression Denial of Service (ReDoS)
At a glance
- Published
- Updated
- CVE
- CVE-2021-27291
- Aliases
- PYSEC-2021-141
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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 1.1, fixed 2.7.4 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2021-27291 ADVISORY
- https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 WEB
- https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce WEB
- https://github.com/pygments/pygments PACKAGE
- https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml WEB
- https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html WEB
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html WEB
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html WEB
- 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
- https://www.debian.org/security/2021/dsa-4878 WEB
- https://www.debian.org/security/2021/dsa-4889 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |