Answer in brief
CVE-2025-26595 records a High severity (CVSS 7.8) vulnerability in Xorg: xwayland: buffer overflow in xkbvmodmasktext(). 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
Jun 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
A buffer overflow flaw was found in X.Org and Xwayland. The code in XkbVModMaskText() allocates a fixed-sized buffer on the stack and copies the names of the virtual modifiers to that buffer. The code fails to check the bounds of the buffer and would copy the data regardless of the size.
Quoted source text, attributed separately from HOL analysis.