A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.
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Score 5.5 from GitHub Security Advisory published 2025-06-17. NVD baseline CVSS 6.1; sources differ by 0.6.
A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.
June 17, 2025
April 15, 2026
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | xwayland (2:24.1.6-1ubuntu0.1) @ plucky | 2026-05-21 | ubuntu |
| redhat | xorg-x11-server-Xwayland-0:22.1.9-6.el9_4 | 2025-07-02 | redhat |
| redhat | xorg-x11-server-Xwayland-0:24.1.5-4.el10_0 | 2025-06-23 | redhat |
| redhat | xorg-x11-server-Xwayland-0:23.2.7-4.el9_6 | 2025-06-23 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: data leak in xfixes extension's xfixessetclientdisconnectmode
RHSA-2025:10258 — Important
RHSA-2025:9303 — Important
RHSA-2025:9304 — Important
X.Org X Server vulnerabilities
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Explore the affected products and dependency analysis for CVE-2025-49177
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msrc · redhat
CWE-200