Is CVE-2025-26599 actively exploited?

CVE-2025-26599 has no public evidence of in-the-wild exploitation as of 2025-11-03.

What is the CVSS score for CVE-2025-26599?

CVE-2025-26599 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-2025-26599?

Patch guidance is available from tigervnc security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2025-26599.

Fix CVE-2025-26599 - HIGH tigervnc tigervnc

Q: Which products are affected by CVE-2025-26599?

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

Description

An access to an uninitialized pointer flaw was found in X.Org and Xwayland. The function compCheckRedirect() may fail if it cannot allocate the backing pixmap. In that case, compRedirectWindow() will return a BadAlloc error without validating the window tree marked just before, which leaves the validated data partly initialized and the use of an uninitialized pointer later.

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-824 CWE-824

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