Answer in brief
CVE-2026-109904 records a Medium severity (CVSS 6.9) vulnerability in X.Org Server XRes QueryClientIds Request Size Overflow. The current sources do not mark it as known exploited. The current feed maps X.Org/xorg-x11-server (generic), X.Org/xwayland (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 6.9. 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 X.Org/xorg-x11-server (generic), X.Org/xwayland (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| X.Org/xorg-x11-servergeneric | >=0 <21.1.26 | 21.1.26 |
| X.Org/xwaylandgeneric | >=0 <24.1.15 | 24.1.15 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
A buffer overread caused by an integer-overflow in Proc/SProcXResQueryClientIds in X.Org xwayland before 24.1.15 and X Server before 21.1.26 could be used by attackers on authenticated X clients to crash the server or leak out information.
Quoted source text, attributed separately from HOL analysis.