CVE-2025-49179 Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extension
An integer overflow in the X Record extension allows clients to bypass length checks, potentially leading to security bypasses in Xorg-based operating systems.
- 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-2025-49179?
CVE-2025-49179 is a high-severity vulnerability in Red Hat Enterprise Linux 10, published on 17 Jun 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients function does not check for an integer overflow when computing request length, which allows a client to bypass length checks.
Weakness: CWE-190
Which versions are affected by CVE-2025-49179?
How do I fix CVE-2025-49179?
Apply the vendor's patch.
Is CVE-2025-49179 being exploited?
There is no known exploitation of CVE-2025-49179 in the wild and no public exploit code.
Sources
Also known as AZL-64193, AZL-64239, AZL-64265, BELL-CVE-2025-49179, DEBIAN-CVE-2025-49179, GHSA-q547-25x8-mx66 and 1 more.