8.2 High

CVE-2026-121963 FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close

Description

FreeRDP before 3.32.2 contains a use-after-free vulnerability in the asynchronous dynamic rdpsnd channel that allows malicious RDP servers to trigger freed callback access by closing the channel with queued audio PDUs. Attackers can send a training PDU then close the channel so the playback thread reads the freed callback in rdpsnd_virtual_channel_write, crashing the client.

CVSS 4.0 detail

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector: Network
Attack complexity: High
Attack requirements: Present
Privileges required: None
Interaction: None
Confidentiality: None
Integrity: None
Availability: High
Confidentiality of other systems: None
Integrity of other systems: None
Availability of other systems: None

Affected products and versions

Product	Affected versions	Fixed in
FreeRDP 3.32	earliest → < 3.32.2	3.32.2

References

GitHub Security Advisory (GHSA-cx9c-q4jc-wm6c) github.com
VulnCheck Advisory: FreeRDP before 3.32.2 Use-After-Free via Dynamic rdpsnd Channel Close www.vulncheck.com

Timeline

Published November 4, 2026
Last modified November 4, 2026

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