# CVE-2026-121410: FreeRDP denial of service in RDPGFX ALPHA WIRETOSURFACE_2

Source: https://junglewise.ai/threats/cve-2026-121410-freerdp-before-3-32-2-contains-a-denial-of-service-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-03. Updated: 2026-11-03  
License: CC BY 4.0 with a link back

CVE-2026-121410 · Severity: medium · CVSS 4.3 · Published 2026-11-03

FreeRDP is a client library for connecting to Remote Desktop Protocol servers. A malicious RDP server can send a crafted graphics command that causes the FreeRDP client to crash, terminating the user's remote desktop session. The vulnerability requires the server to be actively malicious or compromised, and the client to have graphics support enabled.

Technologies: [FreeRDP](https://junglewise.ai/threats/technologies/freerdp). Vendors: [FreeRDP](https://junglewise.ai/threats/vendors/freerdp).

## Quick answers

**Is CVE-2026-121410 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121410 being exploited in the wild.

**How severe is CVE-2026-121410?** Medium severity, with a CVSS score of 4.3, published 3 November 2026.

**Which products and versions are affected?** FreeRDP before 3.32.2.

**Is there a fix for CVE-2026-121410?** 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-2026-121410 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-121410?** 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 RDPGFX ALPHA WIRETOSURFACE_2 handler fails to validate surface dimensions, allowing a server to send a PDU with zero width and height. This causes either an assertion failure in verbose-assert builds or a division-by-zero error in the stream validation code (Stream_CheckAndLogRequiredLengthEx). The attack requires an established RDPGFX dynamic channel with a valid surface already created on the client.

## Affected products

- FreeRDP FreeRDP before 3.32.2

## Timeline

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

## References

- [https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqw6-jf2h-6fj6](https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-fqw6-jf2h-6fj6)
- [https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-rdpgfx-alpha-wiretosurface-2](https://www.vulncheck.com/advisories/freerdp-before-3.32.2-denial-of-service-via-rdpgfx-alpha-wiretosurface-2)

## Related threats

- [FreeRDP heap use-after-free in brush cache](https://junglewise.ai/threats/cve-2026-125394-freerdp-before-3-33-0-contains-a-heap-use-after-free)
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- [FreeRDP use-after-free in dynamic rdpsnd channel](https://junglewise.ai/threats/cve-2026-121963-freerdp-before-3-32-2-contains-a-use-after-free-vulnerability-in)
- [FreeRDP denial of service in NLA shadow server via malformed TSRequest](https://junglewise.ai/threats/cve-2026-121960-freerdp-before-3-32-2-contains-a-denial-of-service-vulnerability)
- [FreeRDP heap out-of-bounds write in RDPGFX HashTable_GetKeys](https://junglewise.ai/threats/cve-2026-121958-freerdp-through-3-32-1-has-a-heap-out-of-bounds-write-in-the)