CVE-2026-121962

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

ProductFreeRDP

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

FreeRDP3.32.2 or later
freerdp freerdp3.32.2 or later

Vendor advisories

github.com/FreeRDP/FreeRDP/security/advisories/GHSA-j536-qc58-pmf8

Affected products

Product	Affected versions	Fixed in
FreeRDP	No range specified	3.32.2
freerdp freerdp	v < 3.32.2	3.32.2

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