Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck

CVE-2026-121962FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read

High 8.1

In plain English

A high-severity out-of-bounds write in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.3%top 74.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121962
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121962
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121962

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

Weakness: CWE-787 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References

GitHub Security Advisory (GHSA-j536-qc58-pmf8) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Heap Buffer Overflow via Early User Authorization Read third-party-advisory