Medium

Pydantic regular expression denial of service

Disclosed: 15.04.2024
Updated: 11.10.2026 14:19

Regular expression denial of service in Pydantic < 2.4.0, < 1.10.13 allows remote attackers to cause denial of service via a crafted email string.

Affected software

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Platform	Package	Vulnerable versions	Fixed in
Python (PyPI)	pydantic	>= 2.0.0, < 2.4.0, < 1.10.13	2.4.0, 1.10.13

References

CVSS score 5.9/10

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-1333
Platform: Python (PyPI)
Package: pydantic
Disclosed: 15.04.2024
Updated: 11.10.2026 14:19

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2026-1812 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-mr82-8j83-vxmv - CC BY 4.0

Vulnerability history: pydantic

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

Total entries: 2
First → latest: 05.2021 04.2024
Without a fix: 0
Exploited in attacks: 0

Severity breakdown

Medium 2

Disclosures per year

2021: 1
2022: 0
2023: 0
2024: 1
2025: 0
2026: 0

15.04.2024

Pydantic regular expression denial of service this entry

Medium · 5.9 CVE-2024-3772 >= 2.0.0, < 2.4.0, < 1.10.13 2.4.0, 1.10.13
13.05.2021

Use of "infinity" as an input to datetime and date fields causes infinite loop in pydantic

Medium · 3.3 CVE-2021-29510 < 1.6.2, >= 1.8, < 1.8.2, >= 1.7, < 1.7.4 1.6.2, 1.8.2, 1.7.4

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