CVE-2025-26596 Xorg: xwayland: heap overflow in xkbwritekeysyms()
A heap overflow in Xorg and Xwayland allows attackers to execute arbitrary code or cause a denial of service via crafted key symbol data.
- 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-2025-26596?
CVE-2025-26596 is a high-severity memory corruption vulnerability in Redhat Enterprise Linux, published on 25 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.
Weakness: CWE-787
Which versions are affected by CVE-2025-26596?
It affects 4 products.
Products include Redhat Enterprise Linux, Tigervnc Tigervnc, X.org X Server, X.org Xwayland.
How do I fix CVE-2025-26596?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-26596 being exploited?
There is no known exploitation of CVE-2025-26596 in the wild and no public exploit code.
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Sources
Also known as AZL-57280, AZL-57404, AZL-57414, BELL-CVE-2025-26596, DEBIAN-CVE-2025-26596, GHSA-c52f-45m8-h2r6 and 1 more.