CVE-2025-1558 Denial of Service Via Malicious GIF

Q: Is CVE-2025-1558 being exploited?

There is no known exploitation of CVE-2025-1558 in the wild and no public exploit code.

Q: How do I fix CVE-2025-1558?

No fix has been published for CVE-2025-1558 yet. Limit exposure of the affected software until one is available.

Medium 6.5 Published 24 Mar 2025 Updated 24 Mar 2025

Attackers can crash the Mattermost Android app by sending maliciously crafted GIF images, requiring users to upgrade to a patched version.

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-2025-1558?

CVE-2025-1558 is a medium-severity denial of service vulnerability in Mattermost, published on 24 Mar 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Mattermost Mobile Apps versions <=2.25.0 fail to properly validate GIF images prior to rendering which allows a malicious user to cause the Android application to crash via message containing a maliciously crafted GIF.

Weakness: CWE-1287

Which versions are affected by CVE-2025-1558?

It affects 1 product.

Products include Mattermost Mattermost Mobile.

How do I fix CVE-2025-1558?

No fix has been published for CVE-2025-1558 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-2025-1558 being exploited?

There is no known exploitation of CVE-2025-1558 in the wild and no public exploit code.

Sources

Also known as GHSA-5p3r-7jhw-3cm2.