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    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.

    Published:Sep 7, 2022
    Last Modified:Dec 3, 2025
    EPS:Sep 7, 2022
    EPSS Score:0.00705
    CVSS Score:7.5

    Affected Products

    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Sqlalchemy
    Product
    Mako

    Exploits

    https://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/https://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-492 Regular Expression Exponential Blowup

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    References

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

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