Use After Free in Freerdp
CVE-2026-121953
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.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6wqx-rv3q-vcxp (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-rdpgfx-dy… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121953?
- CVE-2026-121953 is a critical-severity vulnerability in Freerdp, classified under Use After Free. CVSS score: 9.8/10. Published 2026-11-04.
- How severe is CVE-2026-121953?
- Critical severity. CVSS v3 base score is 9.8 out of 10.