CVE-2026-22851 | THREATINT

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free. Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1.

PUBLISHED Reserved 2026-01-12 | Published 2026-01-14 | Updated 2026-01-14 | Assigner GitHub_M

MEDIUM: 6.9CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

Problem types

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-416: Use After Free

Product status

< 3.20.1

affected

References

github.com/...reeRDP/security/advisories/GHSA-8g87-6pvc-wh99

github.com/FreeRDP/FreeRDP/releases/tag/3.20.1

cve.org (CVE-2026-22851)

nvd.nist.gov (CVE-2026-22851)

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