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.

• CWE-617

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6p3w-fv52-cf24Vendor Advisory
• https://www.vulncheck.com/advisories/freerdp-3.0.0-before-3.32.2-denial-of-service-via-rts-padding-assertionThird Party Advisory

Published

Nov 3, 2026

Last Modified

Nov 3, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-121390FreeRDP 3.0.0 before 3.32.2 built with WITH_AAD=ON contains …4.3
• CVE-2026-121391FreeRDP from 3.0.0 before 3.32.2 contains a file descriptor …4.3
• CVE-2026-121392FreeRDP before 3.32.2 contains an improper certificate valid…7.4
• CVE-2026-121393FreeRDP from 3.0.0 before 3.32.2 contains a denial of servic…6.5
• CVE-2026-121394FreeRDP from 3.11.0 before 3.32.2 contains an assertion fail…6.5
• CVE-2026-121395FreeRDP from 3.17.0 before 3.32.2 contains an assertion fail…6.5
• CVE-2026-121397FreeRDP before 3.32.2 contains a heap buffer over-read vulne…4.3
• CVE-2026-121398FreeRDP before 3.32.2 contains a cross-thread use-after-free…5.9
• CVE-2026-121399FreeRDP before 3.32.2 contains a memory allocation vulnerabi…4.3
• CVE-2026-121400FreeRDP before 3.32.2 contains a denial-of-service vulnerabi…6.5
• CVE-2026-121401FreeRDP before 3.32.2 contains a denial of service vulnerabi…4.3
• CVE-2026-121402FreeRDP before 3.32.2 contains a NULL pointer dereference vu…6.5