Denial of Service Vulnerability in Pygments Parser from Pygments Vendor
CVE-2021-27291

7.5HIGH

Key Information:

Vendor

Pygments

Status
Pygments
Vendor
CVE Published:
17 March 2021

What is CVE-2021-27291?

Pygments, a popular syntax highlighter, contains a vulnerability in its lexer implementation where some regular expressions exhibit exponential or cubic worst-case complexity. This flaw can be exploited by attackers who craft malicious inputs that trigger extensive backtracking in the regex engine, leading to denial of service conditions. This vulnerability affects versions 1.1 and above, and has been addressed in the latest update (2.7.4). Users are encouraged to update to the fixed version to mitigate potential risks.

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References

https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb49...
x_refsource_MISC
https://github.com/pygments/pygments/commit/2e7e8c4a7b318...
x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2021/03/msg0...
mailing-listx_refsource_MLIST

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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