CVE-2024-3772: Regular expression denial of service in Pydanic < 2.4.0, < 1.10.13 allows remote attackers to cause denial of

Q: How urgent is CVE-2024-3772?

Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

MEDIUM 5.9REMOTEUPGRADEMITIGATE

CVE-2024-3772 is a medium-severity flaw (CVSS 5.9) affecting pydantic, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 39%)
CISA exploited list	No
Weakness	CWE-1333
Published	2024-04-15
Last modified	2026-06-17

Publisher (CNA): DirectCyber · Vendor: fedoraproject · pydantic

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-04-15 03:16 UTCPublished CVE record published
2026-06-17 07:44 UTCUpdated Record last modified

pydantic pydantic UPGRADE

Affected: < 1.10.13 · >= 2.0 and < 2.4.0

Fixed in: 1.10.13, 2.4.0

Safe to downgrade to: a release before 2.0

1. Check installed version

apt-cache policy pydantic || rpm -q pydantic || pydantic --version

2. UPGRADE to 1.10.13 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pydantic

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pydantic

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0 (Debian / Ubuntu)

apt-cache madison pydantic sudo apt install pydantic=<VERSION_BEFORE_2.0> sudo apt-mark hold pydantic

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list pydantic sudo dnf downgrade pydantic-<VERSION_BEFORE_2.0> sudo dnf versionlock add pydantic

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

fedoraproject fedora MITIGATE

Affected: 38

Fixed in: no fixed release known

Safe to downgrade to: a release before 38

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-3772?

pydantic: upgrade to 1.10.13, 2.4.0; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-3772 being exploited?

CVE-2024-3772 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-3772 affect?

CVE-2024-3772 affects pydantic, fedora. Severity is medium (CVSS 5.9). 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.

How urgent is CVE-2024-3772?

Priority 46/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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