CVE-2022-40023

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 v4.0 GitHub

8.7 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS v3.1 NVD

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

EPSS

2.17% chance of exploitation in the next 30 days, 82nd percentile

Published

2022-09-07

Updated

2025-12-03

Proof-of-concept exploits (1)

• https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/

Security advisories

• sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21
• https://lists.debian.org/debian-lts-announce/2022/09/msg00026.html
• https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages
• https://pyup.io/vulnerabilities/CVE-2022-40023/50870
• advisories/GHSA-v973-fxgf-6xhp

References

• CVE Record
• NVD entry