CVE-2026-91948

HighCVSS 7.5/10Last modified Sep 17, 2026

Description

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in server-side static virtual channel handling when CHANNEL_OPTION_SHOW_PROTOCOL is enabled. Authenticated clients can queue oversized channel messages that cause buffer underflow and corrupt heap memory including live pointers, potentially enabling code execution.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-191

Affected software

VendorProductVersions
FreeRDPFreeRDP>= 3.28.0, < 3.31.0

References

Timeline

Published
Sep 15, 2026
Last modified
Sep 17, 2026
NVD status
Deferred

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CVE-2026-91948: High severity, CVSS 7.5 | Vulnix