CVE-2025-0476 Mobile crash via file with specially crafted filename

Q: Is CVE-2025-0476 being exploited?

There is no known exploitation of CVE-2025-0476 in the wild and no public exploit code.

Q: How do I fix CVE-2025-0476?

No fix has been published for CVE-2025-0476 yet. Limit exposure of the affected software until one is available.

Medium 4.3 Published 15 Jan 2025 Updated 16 Jan 2025

An attacker can crash the Mattermost mobile app for users by sending a channel attachment with a specially crafted filename.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-0476?

CVE-2025-0476 is a medium-severity denial of service vulnerability in Mattermost, published on 15 Jan 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Mattermost Mobile Apps versions <=2.22.0 fail to properly handle specially crafted attachment names, which allows an attacker to crash the mobile app for any user who opened a channel containing the specially crafted attachment

Weakness: CWE-1287

Which versions are affected by CVE-2025-0476?

It affects 1 product.

Products include Mattermost Mattermost Mobile.

How do I fix CVE-2025-0476?

No fix has been published for CVE-2025-0476 yet. Limit exposure of the affected software until one is available.

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-2025-0476 being exploited?

There is no known exploitation of CVE-2025-0476 in the wild and no public exploit code.

Sources

Also known as GHSA-2rqq-v9v7-f3mq.