CVE-2026-91948
HIGH
NVD
CVSS Score
7.5
Severity
HIGH
Published
Sep 15, 2026
Vendor
unknown
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.
References
- 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