CVE Vulnerabilities

CVE-2022-40023

Inefficient Regular Expression Complexity

Published: Sep 07, 2022 | Modified: Aug 08, 2023
CVSS 3.x
7.5
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.x
RedHat/V2
RedHat/V3
7.5 MODERATE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Ubuntu
MEDIUM

Sqlalchemy mako before 1.2.2 is vulnerable to Regular expression Denial of Service when using the Lexer class to parse. This also affects babelplugin and linguaplugin.

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
Mako Sqlalchemy * 1.2.2 (excluding)
Red Hat Enterprise Linux 8 RedHat python-mako-0:1.0.6-14.el8 *
Red Hat Enterprise Linux 9 RedHat python-mako-0:1.1.4-6.el9 *
Mako Ubuntu bionic *
Mako Ubuntu devel *
Mako Ubuntu esm-infra/bionic *
Mako Ubuntu esm-infra/xenial *
Mako Ubuntu focal *
Mako Ubuntu jammy *
Mako Ubuntu kinetic *
Mako Ubuntu lunar *
Mako Ubuntu trusty *
Mako Ubuntu upstream *
Mako 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