CVE-2022-25326 Denial of Service in fscrypt

Medium 5.5 Published 25 Feb 2022 Updated 21 Apr 2025

Unprivileged users can exhaust filesystem space because fscrypt creates world-writable directories by default during setup.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2022-25326?

CVE-2022-25326 is a medium-severity denial of service vulnerability in Google LLC fscrypt, published on 25 Feb 2022. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

fscrypt through v0.3.2 creates a world-writable directory by default when setting up a filesystem, allowing unprivileged users to exhaust filesystem space. We recommend upgrading to fscrypt 0.3.3 or above and adjusting the permissions on existing fscrypt metadata directories where applicable.

Weakness: CWE-400

Which versions are affected by CVE-2022-25326?

5 open source packages ship an affected version, including github.com/google/fscrypt. It affects 1 product.

Package	Affected	Fixed in
`github.com/google/fscrypt` Go	All versions	`0.3.3`
`github.com/google/fscrypt` Go	All versions	`0.3.3`
`github.com/google/fscrypt` Go	All versions	`0.3.3`
`github.com/google/fscrypt` Go	All versions	`0.3.3`
`github.com/google/fscrypt` Go	All versions	`0.3.3`

Products include Google Fscrypt.

How do I fix CVE-2022-25326?

Upgrade github.com/google/fscrypt to 0.3.3 or later.

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-2022-25326 being exploited?

There is no known exploitation of CVE-2022-25326 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2022-25326, GHSA-chxf-fjcf-7fwp, GHSA-mpq4-rjj8-fjph, GO-2022-0339, UBUNTU-CVE-2022-25326.