CVE-2022-34749

Published: Jul 25, 2022Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

Description

In mistune through 2.0.2, support of inline markup is implemented by using regular expressions that can involve a high amount of backtracking on certain edge cases. This behavior is commonly named catastrophic backtracking.

Affected (2)

Products: Mistune Project: Mistune · Fedoraproject: Fedora

1 product

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Mistune Project Mistune	Up to 2.0.2

Configuration B

1 vulnerable

Vulnerable Software	Affected Versions
Fedoraproject Fedora	Version 37

Related CWEs

CWE-1333

Inefficient Regular Expression Complexity

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

References (6)

https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2

Source: cve@mitre.org

PatchThird Party Advisory

https://github.com/lepture/mistune/releases

Source: cve@mitre.org

Release NotesThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/

Source: cve@mitre.org

https://github.com/lepture/mistune/commit/a6d43215132fe4f3d93f8d7e90ba83b16a0838b2

Source: af854a3a-2127-422b-91ae-364da2661108

PatchThird Party Advisory

https://github.com/lepture/mistune/releases

Source: af854a3a-2127-422b-91ae-364da2661108

Release NotesThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQHXITQ2DSBYOILKHXBSBB7PFBPZHF63/

Source: af854a3a-2127-422b-91ae-364da2661108

Timeline

No history available yet.