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.
References (9)
Core 9
Core References
Exploit, Third Party Advisory x_refsource_misc
https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce
Patch, Third Party Advisory x_refsource_misc
https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4878
Third Party Advisory vendor-advisory
x_refsource_debian
https://www.debian.org/security/2021/dsa-4889
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
Mailing List, Third Party Advisory vendor-advisory
x_refsource_fedora
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
Mailing List, Third Party Advisory mailing-list
x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
Scores
CVSS v3
7.5
EPSS
0.0340
EPSS Percentile
87.5%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Details
CWE
CWE-1333
Status
published
Products (6)
debian/debian_linux
9.0
debian/debian_linux
10.0
fedoraproject/fedora
32
fedoraproject/fedora
33
pygments/pygments
1.1 - 2.7.4
pypi/Pygments
1.1 - 2.7.4PyPI
Published
Mar 17, 2021
Tracked Since
Feb 18, 2026