CVE-2024-3772 Regular expression denial of service in Pydantic < 2.4.0

Q: What is CVE-2024-3772?

CVE-2024-3772 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 15 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Q: Which versions are affected by CVE-2024-3772?

5 open source packages ship an affected version, including pydantic. It affects 2 products.

Q: Is CVE-2024-3772 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-3772 exists.

Q: How do I fix CVE-2024-3772?

Upgrade pydantic to a fixed version for your release line: 1.10.13 or 2.4.0.

Medium 5.9 Published 15 Apr 2024 Updated 13 Feb 2025

Remote attackers can cause denial of service in Pydantic by submitting crafted email strings that trigger excessive regex processing.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2024-3772?

CVE-2024-3772 is a medium-severity denial of service vulnerability in Fedoraproject Fedora, published on 15 Apr 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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

Weakness: CWE-1333

Which versions are affected by CVE-2024-3772?

5 open source packages ship an affected version, including pydantic. It affects 2 products.

Package	Affected	Fixed in
`pydantic` PyPI	All versions	`1.10.13, 2.4.0`
`pydantic` PyPI	All versions	`1.10.13`
`pydantic` PyPI	All versions	`1.10.13`
`pydantic` PyPI	From `2.0.0`	`2.4.0`
`pydantic` PyPI	From `2.0.0`	`2.4.0`

Linux distribution packages (3)

`python-pydantic` SUSE:Linux Enterprise Module for Public Cloud 15 SP4	All versions	`1.10.8-150400.9.10.1`
`python-pydantic` SUSE:Linux Enterprise Module for Python 3 15 SP6	All versions	`1.10.8-150400.9.10.1`
`python-pydantic` openSUSE:Leap 15.6	All versions	`1.10.8-150400.9.10.1`

Products include Fedoraproject Fedora, Pydantic Pydantic.

How do I fix CVE-2024-3772?

Upgrade pydantic to a fixed version for your release line: 1.10.13 or 2.4.0.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-3772 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2024-3772 exists.

All Fedoraproject Fedora vulnerabilities

Sources

Also known as CLSA-2025-1757895135, CLSA-2026-1789456962, DEBIAN-CVE-2024-3772, GHSA-mr82-8j83-vxmv, PYSEC-2026-1812, ROOT-APP-PYPI-CVE-2024-3772 and 3 more.