Sqlalchemy mako up to 1.2.1 Lexer incorrect regex

HistoryDiffrelatejsonxmlCTI

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Sqlalchemy mako up to 1.2.1 and classified as critical. This affects the function Lexer. Performing a manipulation results in incorrect regex. This vulnerability is cataloged as CVE-2022-40023. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Sqlalchemy mako up to 1.2.1. This affects the function Lexer. The manipulation with an unknown input leads to a incorrect regex vulnerability. CWE is classifying the issue as CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. This is going to have an impact on availability. The summary by CVE is:

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.

The weakness was shared 09/07/2022 as 366. The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2022-40023 since 09/06/2022. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 239800 (TencentOS Server 3: python-mako (TSSA-2023:0137)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.2.2 eliminates this vulnerability. Applying the patch 925760291d6efec64fda6e9dd1fd9cfbd5be068c is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (239800), EUVD (EUVD-2022-0149) and CERT Bund (WID-SEC-2023-1185). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Fedora Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
Gentoo Linux
SUSE openSUSE
Red Hat OpenShift
RESF Rocky Linux

Productinfo

Vendor

Sqlalchemy

Name

mako

Version

License

open-source

Website

Product: https://github.com/sqlalchemy/mako/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Incorrect regex
CWE: CWE-185 / CWE-697
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 239800
Nessus Name: TencentOS Server 3: python-mako (TSSA-2023:0137)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mako 1.2.2
Patch: 925760291d6efec64fda6e9dd1fd9cfbd5be068c

Timelineinfo

09/06/2022 🔍
09/07/2022 +1 days 🔍
09/07/2022 +0 days 🔍
12/03/2025 +1183 days 🔍

Sourcesinfo

Product: github.com

Advisory: 366
Status: Confirmed

CVE: CVE-2022-40023 (🔍)
GCVE (CVE): GCVE-0-2022-40023
GCVE (VulDB): GCVE-100-208029
EUVD: 🔍
CERT Bund: WID-SEC-2023-1185 - Red Hat Enterprise Linux: Mehrere Schwachstellen

Entryinfo

Created: 09/07/2022 17:01
Updated: 12/03/2025 08:34
Changes: 09/07/2022 17:01 (43), 06/20/2025 08:05 (16), 11/29/2025 21:54 (7), 12/03/2025 08:18 (1), 12/03/2025 08:34 (12)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.