CVE-2026-91948
HIGHCVSS 7.5Description
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.
Timeline
Published:September 15th, 2026 4:17 PM
Last modified:September 16th, 2026 7:47 PM
CVSS Scoring
CVSS v3: 7.5 (HIGH)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/FreeRDP/FreeRDP/commit/40d9202cd95551600c07437ce6bd5ecd7d31e57b
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9jcm-x588-gh26
- https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-write-via-show-protocol
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9jcm-x588-gh26
Source: NIST NVD · Data may lag official sources by up to one minute