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CVE-2026-50262

medium

An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes().

Vendor / product: X.org — x server

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.

CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Severity source: NVD CVSS v3.1 (secalert@redhat.com)
Timeline (UTC)
Published: 2026-06-05 12:16
Modified: 2026-11-05 22:18
NVD status: Modified
Last synced 4 hours ago
Verified against the source API 2026-11-05 22:23 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).

Affected products

x.org / x_server <21.1.23
x.org / xwayland <24.1.12
redhat / enterprise_linux 7.0, 8.0, 9.0, 10.0

Weakness classification (CWE)

CWE-125

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

Vendor advisory: https://access.redhat.com/security/cve/CVE-2026-50262
Vendor advisory: https://bugzilla.redhat.com/show_bug.cgi?id=2485387
Vendor advisory: https://lists.x.org/archives/xorg-announce/2026-June/003702.html
Patch / mitigation: https://gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145

References

Data sources

NVD CVE API 2.0 — fetched 2026-11-05 22:23 UTC · record ↗

Learn the basics

Understanding CVEs and CVSS Scores

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CVE-2026-50263CVE-2026-34002CVE-2026-34000CVE-2025-62230CVE-2025-62231