Answer in brief
CVE-2025-26596 records a High severity (CVSS 7.8) vulnerability in Xorg: xwayland: heap overflow in xkbwritekeysyms(). The current sources do not mark it as known exploited. The current feed maps xserver (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps xserver (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| xservergeneric | >=0 <21.1.16 || >=22.0.0 <24.1.6 | 21.1.16, 24.1.6 |
Published upstream
Feb 25, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
A heap overflow flaw was found in X.Org and Xwayland. The computation of the length in XkbSizeKeySyms() differs from what is written in XkbWriteKeySyms(), which may lead to a heap-based buffer overflow.
Quoted source text, attributed separately from HOL analysis.