CVE-2026-91948

Name	CVE-2026-91948
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
freerdp2 (PTS)	bookworm	2.11.7+dfsg1-6~deb12u1	fixed
freerdp3 (PTS)	trixie	3.15.0+dfsg-2.1+deb13u3	fixed
	forky, sid	3.32.1+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version
freerdp2	source	(unstable)	(not affected)
freerdp3	source	trixie	(not affected)
freerdp3	source	(unstable)	3.31.0+dfsg-1

Notes

[trixie] - freerdp3 <not-affected> (Only affects 3.28 and later)
- freerdp2 <not-affected> (Only affects 3.28 and later)
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9jcm-x588-gh26
https://www.openwall.com/lists/oss-security/2026/09/01/2