Is CVE-2026-121407 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-121407 being exploited in the wild.

How severe is CVE-2026-121407?

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

Is there a fix for CVE-2026-121407?

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-2026-121407 attacked?

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

Am I affected by CVE-2026-121407?

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-2026-121407: FreeRDP shadow server denial of service in remdesk channel

CVE-2026-121407 · Severity: medium · CVSS 6.5 · Published 2026-11-03

FreeRDP's shadow server component enables remote desktop sharing and collaboration. An authenticated attacker can send a malformed network message over the remdesk channel that triggers a fatal assertion, crashing the server and disconnecting all active sessions. This impacts availability and causes denial of service.

Technologies: FreeRDP. Vendors: FreeRDP.

Quick answers

Is CVE-2026-121407 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-121407 being exploited in the wild.
How severe is CVE-2026-121407?: 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-2026-121407?: 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-2026-121407 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-121407?: 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 remdesk_server_thread where an inverted framing condition allows a malformed PDU with mismatched length declarations to overflow a 4096-byte stream buffer. An authenticated RDP client sends an 8192-byte payload claiming an 8-byte PDU length, causing Stream_Seek to trigger a fatal WinPR assertion when the stream position exceeds capacity. The attacker must authenticate to the RDP shadow server and join the remdesk static virtual channel.

Affected products

FreeRDP FreeRDP before 3.32.2

Timeline

2026-10-19: disclosed
2026-11-03: advisory

References

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