CVE-2025-49179highCWE-190

CVE-2025-49179: high-severity vulnerability in X.Org xwayland

Xorg-x11-server-xwayland: xorg-x11-server: tigervnc: integer overflow in x record extension

Published 17 Jun 2025 · Updated 04 Nov 2026

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.3epss 0.3%

A flaw was found in the X Record extension. The RecordSanityCheckRegisterClients function does not check for an integer overflow when computing request length, which allows a client to bypass length checks.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

Affected products

Related CVEs — X.Org xwayland

In the same product, most dangerous first.

CVE-2023-4911HIGHGlibc: buffer overflow in ld.so leading to privilege escalationEPSS 63.8%KEV CVE-2024-6387HIGHOpenssh: regresshion - race condition in ssh allows rce/dosEPSS 99.5%CVE-2024-3094CRITICALXz: malicious code in distributed sourceEPSS 90.9%CVE-2024-12084CRITICALRsync: heap buffer overflow in rsync due to improper checksum length handlingEPSS 72.5%CVE-2023-1183MEDIUMArbitrary file writeEPSS 64.9%CVE-2023-34966HIGHSamba: infinite loop in mdssvc rpc service for spotlightEPSS 62.4%

References