CVE Tools
Sign in

CVE-2025-26596

Xorg: xwayland: heap overflow in xkbwritekeysyms()

Published: Feb 25, 2025Updated: Nov 3, 2025 Sources: CVE List NVD BDUCWE-787
NVD MITRE
7.8CVSSHIGH
EPSS Score
0.4%
Top 69.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

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.

CVSS Vector Breakdown

AV:LAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

tigervnctigervnc
On-prem
Communications
x serverx.org
On-prem
Operating Systems / unix-bsd
xwaylandx.org
On-prem
Operating Systems / linux-distro
enterprise linuxredhat
On-premOS
Operating Systems / linux-distro
tigervncoss-projectCommunications
x.orgoss-projectUSOperating Systems
redhatcommercialUSOperating Systemsaka red hat
and 39 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2025:2500
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:2502
access.redhat.com
https://access.redhat.com/errata/RHSA-2025:2861
access.redhat.com
and 28 more references View all →

Timeline

Published
Feb 25, 2025
Last Updated
Nov 3, 2025

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2025-26596 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows