A buffer overread in CheckKeySyms() in X.Org X Server before 21.1.25 and XWayland before 24.1.14 could be used by authenticated X clients to leak small amounts of information from X server memory or potentially crash the X server.
Fix
Vendor advisories in the News 1
- ZDI-26-769: X.Org Server XKB XkbSetMap Request Out-Of-Bounds Read Information Disclosure Vulnerability Zero Day Initiative: published advisories · 2026-10-15
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 4
- StatusReceived → PublishedNVD modified 2026-10-28 16:24
- StatusPublished → ReceivedNVD modified 2026-10-28 17:18
- CVSS6.9 (v4.0, CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N) → 6.9 (v4.0, CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)NVD modified 2026-10-28 17:18
- First seenCVSS 6.9 · x.orgNVD modified 2026-10-28 16:24
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.