Use After Free in Freerdp
CVE-2026-121398
FreeRDP before 3.32.2 contains a cross-thread use-after-free vulnerability in the freerdp-proxy dyn-channel-dump module during session teardown. A malicious RDP target can send dynamic channel data while the front client disconnects, letting the client thread read freed ChannelData and crash the proxy process.
Vulnerability class: Use-After-Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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-v3q2-qjvf-7rqw (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-dyn-chann… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121398?
- CVE-2026-121398 is a medium-severity vulnerability in Freerdp, classified under Use After Free. CVSS score: 5.9/10. Published 2026-11-03.
- How severe is CVE-2026-121398?
- Medium severity. CVSS v3 base score is 5.9 out of 10.