U.S. flag   An official website of the United States government
Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock (Dot gov) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

CVE-2021-27291 Detail

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving NIST webspace. We have provided these links to other web sites because they may have information that would be of interest to you. No inferences should be drawn on account of other sites being referenced, or not, from this page. There may be other web sites that are more appropriate for your purpose. NIST does not necessarily endorse the views expressed, or concur with the facts presented on these sites. Further, NIST does not endorse any commercial products that may be mentioned on these sites. Please address comments about this page to nvd@nist.gov.

Hyperlink Resource
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/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
https://www.debian.org/security/2021/dsa-4878 Third Party Advisory 
https://www.debian.org/security/2021/dsa-4889 Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-1333 Inefficient Regular Expression Complexity cwe source acceptance level NIST  

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Denotes Vulnerable Software
Are we missing a CPE here? Please let us know.

Change History

11 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-27291
NVD Published Date:
03/17/2021
NVD Last Modified:
11/06/2023
Source:
MITRE