Vulnerability in Freerdp
CVE-2026-121396
FreeRDP clients from 3.0.0 before 3.32.2 built with verbose WinPR assertions contain a reachable assertion in rts_read_auth_verifier triggered by malformed RTS padding. Attackers controlling an RD Gateway can send a crafted RPC-over-HTTP RTS PDU with inconsistent authentication padding to abort the connecting client process.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L.
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-6p3w-fv52-cf24 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-denial-of-service-via-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121396?
- CVE-2026-121396 is a medium-severity vulnerability in Freerdp, classified under Reachable Assertion. CVSS score: 4.3/10. Published 2026-11-03.
- How severe is CVE-2026-121396?
- Medium severity. CVSS v3 base score is 4.3 out of 10.