CVE-2025-26601
7.8 · HIGHOverview
CVE-2025-26601 is a high-severity vulnerability affecting tigervnc tigervnc. It was published on February 25, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
Technical Description
A use-after-free flaw was found in X.Org and Xwayland. When changing an alarm, the values of the change mask are evaluated one after the other, changing the trigger values as requested, and eventually, SyncInitTrigger() is called. If one of the changes triggers an error, the function will return early, not adding the new sync object, possibly causing a use-after-free when the alarm eventually triggers.
Remediation
Check the references section for vendor advisories and patches from tigervnc. Update tigervnc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| x.org | x_server | >= 0, < 21.1.16 | Affected |
| x.org | xwayland | >= 0, < 24.1.6 | Affected |
References
Frequently Asked Questions
What is CVE-2025-26601?
CVE-2025-26601 is a high-severity vulnerability affecting tigervnc tigervnc. It was published on February 25, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).
How severe is CVE-2025-26601?
This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-26601?
Check the references section for vendor advisories and patches from tigervnc. Update tigervnc to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-26601?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-26601 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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