CVE-2026-50262 Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes
An out-of-bounds read in the X.Org X server allows attackers to disclose sensitive information via crafted GLX requests.
- 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-2026-50262?
CVE-2026-50262 is a medium-severity 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
An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.
Weakness: CWE-125
Which versions are affected by CVE-2026-50262?
It affects 3 products.
Products include Redhat Enterprise Linux, X.org X Server, X.org Xwayland.
How do I fix CVE-2026-50262?
Apply the vendor's patch.
Is CVE-2026-50262 being exploited?
There is no known exploitation of CVE-2026-50262 in the wild and no public exploit code.
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- 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-89528, AZL-89574, BELL-CVE-2026-50262, CLSA-2026-1782986813, DEBIAN-CVE-2026-50262, ECHO-215b-cde4-2d00 and 2 more.