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CVE-2026-50262 is an out-of-bounds memory access flaw in the X.Org X server and Xwayland affecting __glXDisp_ChangeDrawableAttributes(). The vulnerability is caused by incorrect size validation in GLX request handling, allowing the server to process a client-controlled length that exceeds the bounds of the request buffer. The primary issue is an out-of-bounds read, which can disclose memory contents from beyond the supplied request. A related write path also exists in the same code path, but it requires byte-swapped clients and is therefore not normally reachable in default configurations. Fixed releases include X.Org X server 21.1.23 and Xwayland 24.1.12.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.