CVE-2026-121962

FreeRDP before 3.32.2 contains a heap buffer overflow in transport_default_read_pdu when handling partial Early User Authorization reads during PROTOCOL_HYBRID_EX CredSSP. A malicious RDP server can split the four-byte EUA result into short reads that advance the stream pointer beyond the 16 KiB allocation, causing an out-of-bounds write and client denial of service.

• CWE-787

• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8Exploit, Mitigation, Vendor Advisory
• https://www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-buffer-overflow-via-early-user-authorization-readThird Party Advisory
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8Exploit, Mitigation, Vendor Advisory

Published

Nov 4, 2026

Last Modified

Nov 5, 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.
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