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xorg-x11-server — security advisories

vendor: Xorg9 advisories1 sourcelatest 2026-07-02⚡ RSS feed

Every advisory CSIRTS.com has correlated to xorg-x11-server, newest first — across national CERTs, vendor PSIRTs and vulnerability databases.

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CVE-2026-56000: xorg-x11-server / xwayland GLX contextTags Use-After-Free in CommonMakeCurrent()

unknownCVE-2026-56000msrc2026-07-02

CVE-2026-50257: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

mediumCVSS 6.6CVE-2026-50257msrc2026-06-09

CVE-2026-50256: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libxfont2 name length mismatch

highCVSS 7.8CVE-2026-50256msrc2026-06-09

CVE-2026-50260: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in freecounter()

mediumCVSS 6.6CVE-2026-50260msrc2026-06-09

CVE-2026-50258: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb key types due to unchecked shift levels

highCVSS 7.8CVE-2026-50258msrc2026-06-09

CVE-2026-50262: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: out-of-bounds read/write in glx changedrawableattributes

mediumCVSS 5.5CVE-2026-50262msrc2026-06-09

CVE-2026-50259: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: stack buffer overflow in xkb setmap request via mapwidths indexing

highCVSS 7.8CVE-2026-50259msrc2026-06-09

CVE-2026-50261: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in syncchangecounter()

highCVSS 7.8CVE-2026-50261msrc2026-06-09

CVE-2026-50263: Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()

mediumCVSS 5.5CVE-2026-50263msrc2026-06-09