Paper/Archive/CVE-2026-121953

CVE-2026-121953

FreeRDP FreeRDP — FreeRDP before 3.32.2 Use-After-Free via rdpgfx Dynamic Virtual Channel Close

CVSS 9.8 (CNA)9.8 / 10 × 3029.4 Not in CISA KEV+300.0 No EPSS score.000 × 200.0 No public exploit+100.0 SSVC exploitation: unknown+100.0

Description · from the CVE record

FreeRDP before 3.32.2 has a use-after-free in the client's rdpgfx dynamic virtual channel: a duplicate-name channel with a new ChannelId overwrites the listener's single callback slot, which rdpgfx_on_close frees without clearing. A malicious RDP server can open and close such a channel, then send a PDU on the original channel to crash the client or potentially execute code.

Affected

ProductAffectedFixed inSource

FreeRDP< 3.32.23.32.2CNA

Scores by source

VulnCheck (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

VulnCheck (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

References

advisorygithub.com/FreeRDP/FreeRDP/security/advisories/GHSA-6wqx-rv3q-vcxp writeupvulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-rdpgfx-dynamic-virtual-channel-close