Is CVE-2025-26601 actively exploited?

CVE-2025-26601 has no public evidence of in-the-wild exploitation as of 2025-11-03.

What is the CVSS score for CVE-2025-26601?

CVE-2025-26601 has a CVSS score of 7.8 (HIGH severity). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2025-26601?

Patch guidance is available from tigervnc security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-26601.

Fix CVE-2025-26601 - HIGH tigervnc tigervnc

Q: Which products are affected by CVE-2025-26601?

6 products: tigervnc tigervnc, x.org x server, x.org xwayland, redhat enterprise linux, redhat enterprise linux, and 1 more.

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.

CVSS Metrics

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 Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-416 · Use After Free CWE-416 · Use After Free

Metadata

Primary Vendor: TIGERVNC
Published: 2/25/2025
Last Modified: 11/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

tigervnc : tigervncx.org : x_serverx.org : xwaylandredhat : enterprise_linuxredhat : enterprise_linuxredhat : enterprise_linux

Remediation Guidance

Executive Summary

View on NIST NVD