What is CVE-2026-121961?

CVE-2026-121961 is a medium-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.9/10. Published 2026-11-04.

How severe is CVE-2026-121961?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Freerdp

CVE-2026-121961

FreeRDP before 3.32.2 contains a use-after-free vulnerability in the freerdp-proxy DRDYNVC tracker when intercepting the drdynvc channel. A malicious target server can repeatedly send CREATE_REQUEST_PDU for an active channel id, racing front DATA handling to free a borrowed context and crash the proxy process.

Vulnerability class: Race Condition

Published 2026-11-04 · last modified 2026-11-05.

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

Freerdp

Weakness classification (CWE)

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

References

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-qw7w-hhxq-763c (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
www.vulncheck.com/advisories/freerdp-before-3.32.2-use-after-free-via-drdynvc-t… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-121961?: CVE-2026-121961 is a medium-severity vulnerability in Freerdp, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 5.9/10. Published 2026-11-04.
How severe is CVE-2026-121961?: Medium severity. CVSS v3 base score is 5.9 out of 10.