# CVE-2026-121398: FreeRDP use-after-free in dyn-channel-dump module during session teardown

Source: https://junglewise.ai/threats/cve-2026-121398-freerdp-before-3-32-2-contains-a-cross-thread-use-after-free  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-121398 · Severity: medium · CVSS 5.9 · Published 2026-11-03

FreeRDP is a remote desktop protocol implementation widely used to access Windows systems. A malicious RDP server can exploit a timing race condition in the freerdp-proxy service when it is configured with the dyn-channel-dump module, causing the proxy process to crash by reading freed memory. This vulnerability requires the non-default dyn-channel-dump module to be explicitly loaded, limiting exposure but creating denial-of-service risk for affected deployments.

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

## Quick answers

**Is CVE-2026-121398 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121398 being exploited in the wild.

**How severe is CVE-2026-121398?** Medium severity, with a CVSS score of 5.9, published 3 November 2026.

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

**Is there a fix for CVE-2026-121398?** 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-2026-121398 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-121398?** 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 cross-thread use-after-free exists in the dyn-channel-dump module when a malicious RDP target sends dynamic channel data during front client disconnection. The vulnerability occurs because pf_modules_set_plugin_data() does not clear the module-data table entry when passed a null pointer, allowing the client thread to access freed ChannelData. The attack is triggered by the race between HOOK_TYPE_SERVER_SESSION_END (which deletes the data) and WaitForSingleObject() (which waits for the client thread to finish), requiring a malicious or compromised RDP server and the non-default dyn-channel-dump module to be configured.

## Affected products

- FreeRDP FreeRDP before 3.32.2

## Timeline

- 2026-10-19: disclosed
- 2026-10-19: patched: Version 3.32.2 released
- 2026-11-03: advisory

## References

- [https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v3q2-qjvf-7rqw](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-v3q2-qjvf-7rqw)
- [https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dyn-channel-dump-module](https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dyn-channel-dump-module)

## Related threats

- [FreeRDP heap use-after-free in brush cache](https://junglewise.ai/threats/cve-2026-125394-freerdp-before-3-33-0-contains-a-heap-use-after-free)
- [FreeRDP heap buffer overflow in RD Gateway RPC client](https://junglewise.ai/threats/cve-2026-121964-freerdp-before-3-32-2-contains-a-heap-based-buffer-overflow-in)
- [FreeRDP use-after-free in dynamic rdpsnd channel](https://junglewise.ai/threats/cve-2026-121963-freerdp-before-3-32-2-contains-a-use-after-free-vulnerability-in)
- [FreeRDP denial of service in NLA shadow server via malformed TSRequest](https://junglewise.ai/threats/cve-2026-121960-freerdp-before-3-32-2-contains-a-denial-of-service-vulnerability)
- [FreeRDP heap out-of-bounds write in RDPGFX HashTable_GetKeys](https://junglewise.ai/threats/cve-2026-121958-freerdp-through-3-32-1-has-a-heap-out-of-bounds-write-in-the)