CVE-2022-40023

HIGHNVD 7.57.5—

7.5

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 v3: 7.5
EG Score: 7.5(medium)
EPSS: 77.3%
KEV: Not listed

Published

September 7, 2022

Last Modified

December 3, 2025

References (13)

cve@mitrehttps://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21
cve@mitrehttps://github.com/sqlalchemy/mako/commit/925760291d6efec64fda6e9dd1fd9cfbd5be068c
cve@mitrehttps://github.com/sqlalchemy/mako/issues/366
cve@mitrehttps://lists.debian.org/debian-lts-announce/2022/09/msg00026.html
cve@mitrehttps://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/
cve@mitrehttps://pyup.io/vulnerabilities/CVE-2022-40023/50870/
af854a3a-2127-422b-91ae-364da2661108https://github.com/sqlalchemy/mako/blob/c2f392e0be52dc67d1b9770ab8cce6a9c736d547/mako/ext/extract.py#L21
af854a3a-2127-422b-91ae-364da2661108https://github.com/sqlalchemy/mako/commit/925760291d6efec64fda6e9dd1fd9cfbd5be068c
af854a3a-2127-422b-91ae-364da2661108https://github.com/sqlalchemy/mako/issues/366
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2022/09/msg00026.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/12/msg00004.html
af854a3a-2127-422b-91ae-364da2661108https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/
af854a3a-2127-422b-91ae-364da2661108https://pyup.io/vulnerabilities/CVE-2022-40023/50870/

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	python3-mako (1.0.7+ds1-1ubuntu0.2) @ bionic	2026-05-25	ubuntu
ubuntu	python3-mako (1.1.3+ds1-3ubuntu2.1) @ kinetic	2026-05-25	ubuntu
redhat	python-mako-0:1.0.6-14.el8	2023-05-16	redhat
redhat	python-mako-0:1.1.4-6.el9	2023-05-09	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

PyPI(1)

Package	Vulnerable range	Fixed in	Dependents
mako	0.1.0 ... 1.2.1 (63 versions)	1.2.2	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-1333Inefficient Regular Expression Complexity (ReDoS)

All Vendor Advisories

(5)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 9× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 15:55 UTCEG score recompute
2026-05-25 15:55 UTCVendor advisory

Frequently asked(5)

What is CVE-2022-40023?

CVE-2022-40023 is a high vulnerability published on September 7, 2022. 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.

When was CVE-2022-40023 disclosed?

CVE-2022-40023 was first published in the National Vulnerability Database on September 7, 2022, with the most recent update on December 3, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2022-40023 actively exploited?

CVE-2022-40023 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 77.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2022-40023?

CVE-2022-40023 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2022-40023?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2022-40023, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-40023

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CVE-2022-40023

Published

Last Modified

References (13)

Patch Availability(4)

Affected Packages

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-40023?

Same vendor

Same CWE

CVE-2022-40023

📅 Published

🔄 Last Modified

🔗 References (13)

Patch Availability(4)

Affected Packages

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2022-40023?

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References (13)

Frequently asked(5)

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