What is CVE-2026-50257?

CVE-2026-50257 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

Which CVE IDs does CVE-2026-50257 cover?

CVE-2026-50257 covers the following CVE IDs: CVE-2026-50257. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-50257?

CVE-2026-50257 has a CVSS v3 base score of 6.6, published by Microsoft Security Response Center (MSRC).

CVE-2026-50257MediumCVSS 6.6

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

Vendor

Microsoft Security Response Center (MSRC)

Published

June 9, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-50257 →