CVE-2025-26596
HIGHCVSS 7.8/10EPSS 0.39%
Last modified
CVE-2025-26596 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Tigervnc | Tigervnc | All versions |
| X.Org | X Server | < 21.1.16 |
| X.Org | Xwayland | < 24.1.6 |
| Redhat | Enterprise Linux | 7.0 |
| Redhat | Enterprise Linux | 8.0 |
| Redhat | Enterprise Linux | 9.0 |
References
- https://access.redhat.com/errata/RHSA-2025:2500Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2502Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2861Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2862Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2865Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2866Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2873Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2874Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2875Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2879Third Party Advisory
- https://access.redhat.com/errata/RHSA-2025:2880Third Party Advisory
- https://access.redhat.com/security/cve/CVE-2025-26596Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2345256Issue Tracking
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-26596?
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.
How severe is CVE-2025-26596?
CVE-2025-26596 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.
How do I fix CVE-2025-26596?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2025-26596?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST