Is CVE-2026-121404 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-121404 being exploited in the wild.

How severe is CVE-2026-121404?

Medium severity, with a CVSS score of 6.5, published 3 November 2026.

Is there a fix for CVE-2026-121404?

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-2026-121404 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-121404?

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.

CVE-2026-121404: FreeRDP denial of service in shadow server dynamic-channel handling

CVE-2026-121404 · Severity: medium · CVSS 6.5 · Published 2026-11-03

FreeRDP's shadow server is a remote desktop protocol implementation used to enable remote access to systems. An authenticated RDP client can exhaust CPU resources by sending specially-crafted zero-length messages on audio or graphics channels, causing server threads to spin until the client disconnects. This is a denial of service attack available only to authenticated users.

Technologies: FreeRDP. Vendors: FreeRDP.

Quick answers

Is CVE-2026-121404 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-121404 being exploited in the wild.
How severe is CVE-2026-121404?: Medium severity, with a CVSS score of 6.5, published 3 November 2026.
Which products and versions are affected?: FreeRDP before 3.32.2.
Is there a fix for CVE-2026-121404?: 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-2026-121404 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-121404?: 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

The vulnerability exists in wts_read_drdynvc_data (libfreerdp/core/server.c) which queues DATA payloads even when the payload is zero-length. FreeRDP_WTSVirtualChannelRead peeks without consuming empty messages, causing the audin and rdpgfx channel readers to loop continuously consuming CPU. The attack requires an authenticated RDP connection and the specific channel (audin or rdpgfx) to be open, and is fixed in version 3.32.2.

Affected products

FreeRDP FreeRDP before 3.32.2

Timeline

2026-10-19: disclosed: GitHub Security Advisory published
2026-11-03: advisory: NVD and public advisories published

References

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