CVE Vulnerabilities

CVE-2022-21670

Inefficient Regular Expression Complexity

Published: Jan 10, 2022 | Modified: Jul 24, 2023
CVSS 3.x
5.3
MEDIUM
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 2.x
5 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P
RedHat/V2
RedHat/V3
Ubuntu
LOW

markdown-it is a Markdown parser. Prior to version 1.3.2, special patterns with length greater than 50 thousand characterss could slow down the parser significantly. Users should upgrade to version 12.3.2 to receive a patch. There are no known workarounds aside from upgrading.

Weakness

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

Affected Software

Name Vendor Start Version End Version
Markdown-it Markdown-it_project * 12.3.1 (including)
Node-markdown-it Ubuntu hirsute *
Node-markdown-it Ubuntu impish *
Node-markdown-it Ubuntu kinetic *
Node-markdown-it Ubuntu lunar *
Node-markdown-it Ubuntu trusty *
Node-markdown-it Ubuntu xenial *

Extended Description

	  Attackers can create crafted inputs that
	  intentionally cause the regular expression to use
	  excessive backtracking in a way that causes the CPU
	  consumption to spike.

Potential Mitigations

References