Home/CVE/In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. So
CVE

CVE-2021-27291

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. So

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.

HIGH · CVSS 7.5 EPSS 0.034
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-1333Inefficient Regular Expression Complexity
▤

Affected Products & Versions

3
pygments>= 1.1 and < 2.7.4
debian linuxall versions
fedoraproject fedoraall versions
▤

Affected Packages

1
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
PyPI pygments HIGH fixed in 2.7.4
⚠

Public Exploits & PoCs

1
pocgist.github.com · b1a2cc0c68a35c57188575eb496de5cegist.github.com
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD17 Mar 2021 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
⚑

Vendor Advisories

15
usnUSN-4897-2
suse-csafopenSUSE-SU-2021:1521-1
suse-csafopenSUSE-SU-2021:3839-1
suse-csafopenSUSE-SU-2021:3841-1
suse-csafSUSE-SU-2021:3839-1
🔗

References & Sources

8
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14PatchThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/03/msg00024.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.htmlMailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.htmlMailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
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