Vulnerability DatabaseCVE-2021-27291
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CVE-2021-27291
March 17, 2021
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
Pygments (PYTHON):
Affected version(s) >=1.1 <2.7.4
Fix Suggestion:
Update to version 2.7.4
Related Resources (18)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
https://github.com/advisories/GHSA-pq64-v7f5-gqh8
https://www.debian.org/security/2021/dsa-4878
https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml
https://www.debian.org/security/2021/dsa-4889
https://nvd.nist.gov/vuln/detail/CVE-2021-27291
https://access.redhat.com/security/cve/CVE-2021-27291
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ
https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55
https://github.com/pygments/pygments
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
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CVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
CVSS v2
Base Score:
5
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Weakness Type (CWE)
Uncontrolled Resource Consumption
CWE-400
EPSS
Base Score:
2.75