CVEvulnerability
CVE-2021-27291
7.5 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-03-17
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
- Weaknesses
- CWE-1333
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 configurations
• pygments pygments (>= 1.1 < 2.7.4)
• debian debian linux 9.0
• debian debian linux 10.0
• fedoraproject fedora 32
• fedoraproject fedora 33
Related
Weakness · CWE (1)
- CWE-1333 Inefficient Regular Expression Complexity weakness
References
- https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce Exploit, Third Party Advisory
- https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ lists.fedoraproject.org
- https://www.debian.org/security/2021/dsa-4878 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4889 Third Party Advisory
- https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce Exploit, Third Party Advisory
- https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html Mailing List, Third Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ lists.fedoraproject.org
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ lists.fedoraproject.org
- https://www.debian.org/security/2021/dsa-4878 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4889 Third Party Advisory