CVE-2026-50263 Use after free in Red Hat Enterprise Linux 10
A use-after-free flaw in X.Org X server allows a client to trigger information disclosure by manipulating window attributes and the screen saver.
- 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-2026-50263?
CVE-2026-50263 is a medium-severity use after free vulnerability in Redhat Enterprise Linux, published on 5 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
Weakness: CWE-416
Which versions are affected by CVE-2026-50263?
It affects 3 products.
Products include Redhat Enterprise Linux, X.org X Server, X.org Xwayland.
How do I fix CVE-2026-50263?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-50263 being exploited?
There is no known exploitation of CVE-2026-50263 in the wild and no public exploit code.
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- CVE-2021-20325 Missing fixes for CVE-2021-40438 and CVE-2021-26691 in the versions of httpd, as shipped in Red Hat Enterprise Linux 8.5.0, causes a securit
- CVE-2018-25011 Memory corruption in libwebp
- CVE-2018-25014 Other in libwebp
- CVE-2014-3585 Supply chain in redhat-upgrade-tool
Sources
Also known as AZL-89534, AZL-89589, BELL-CVE-2026-50263, CLSA-2026-1783338681, DEBIAN-CVE-2026-50263, ECHO-4456-5962-a3cb and 2 more.