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Vulnerability record · CVE-2022-40023 · published 7 September 2022

CVE-2022-40023: Sqlalchemy mako inefficient regular expression (redos) vulnerability

Sqlalchemy · Mako

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.

7.5 CVSS 3.1 High EPSS 2.2% · top 18.6% CWE-1333 · Inefficient regular expression (ReDoS)
7.5CVSS 3.1 base score
2.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
13References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21 ExploitThird Party Advisory
https://github.com/sqlalchemy/mako/commit/925760291d6efec64fda6e9dd1fd9cfbd5be068c Patch
https://github.com/sqlalchemy/mako/issues/366 Issue TrackingPatch
https://lists.debian.org/debian-lts-announce/2022/09/msg00026.html Mailing ListThird Party Advisory
https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/ ExploitThird Party Advisory
https://pyup.io/vulnerabilities/CVE-2022-40023/50870/ Third Party Advisory
https://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21 ExploitThird Party Advisory
https://github.com/sqlalchemy/mako/commit/925760291d6efec64fda6e9dd1fd9cfbd5be068c Patch
https://github.com/sqlalchemy/mako/issues/366 Issue TrackingPatch
https://lists.debian.org/debian-lts-announce/2022/09/msg00026.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/12/msg00004.html
https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/ ExploitThird Party Advisory
https://pyup.io/vulnerabilities/CVE-2022-40023/50870/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2022-40023), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.