# CVE-2026-121963: FreeRDP use-after-free in dynamic rdpsnd channel

Source: https://junglewise.ai/threats/cve-2026-121963-freerdp-before-3-32-2-contains-a-use-after-free-vulnerability-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-04. Updated: 2026-11-04  
License: CC BY 4.0 with a link back

CVE-2026-121963 · Severity: medium · CVSS 5.9 · Published 2026-11-04

FreeRDP is an open-source RDP client library used by many remote desktop applications. A malicious RDP server can exploit a timing vulnerability in the audio handling code to cause the FreeRDP client to crash, disrupting user sessions. The vulnerability requires precise timing but does not enable code execution or data theft.

Technologies: [FreeRDP](https://junglewise.ai/threats/technologies/freerdp). Vendors: [FreeRDP](https://junglewise.ai/threats/vendors/freerdp).

## Quick answers

**Is CVE-2026-121963 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121963 being exploited in the wild.

**How severe is CVE-2026-121963?** Medium severity, with a CVSS score of 5.9, published 4 November 2026.

**Which products and versions are affected?** FreeRDP before 3.32.2.

**Is there a fix for CVE-2026-121963?** Yes: fixed in 3.32.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-121963 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-121963?** Check whether you run FreeRDP at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 3.32.2

## Technical details

A use-after-free exists in the asynchronous dynamic virtual channel handling for rdpsnd (audio). When a malicious RDP server sends an audio PDU and immediately closes the channel, the DATA callback queues a PDU while rdpsnd_on_close() frees the channel callback. The playback thread later dereferences the freed callback in rdpsnd_virtual_channel_write(), causing a crash. The vulnerability is in channels/rdpsnd/client/rdpsnd_main.c and requires precise DATA/CLOSE ordering via a race condition; no production trigger rate has been established.

## Affected products

- FreeRDP FreeRDP before 3.32.2

## Timeline

- 2026-10-20: disclosed
- 2026-11-04: advisory

## References

- [https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-cx9c-q4jc-wm6c)
- [https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close](https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dynamic-rdpsnd-channel-close)

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