High severity · published Feb 25, 2025
CVE-2025-26596
A heap overflow flaw was found in X.Org and Xwayland
7.8
CVSS
0.4%
EPSS
No
On KEV
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
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 38% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EL
Enterprise Linux · Redhat
7.0; 8.0; 9.0 · source: NVD
TI
Tigervnc · Tigervnc
All versions, or not specified · source: NVD
XS
X Server · X.org
before 21.1.16 · source: NVD
XW
Xwayland · X.org
before 24.1.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-26596
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-26596
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2500
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2502
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2861
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2862
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2865
Third Party Advisory
https://access.redhat.com/errata/RHSA-2025:2866
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