Vulnerability · Published Nov 3, 2026 · Assigned by VulnCheck

CVE-2026-121399FreeRDP before 3.32.2 Memory Exhaustion via RD Gateway Packet Length

Medium 4.3

In plain English

A medium-severity resource allocation without limits in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium

Exploit odds (30 days)0.3%top 80.9% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 contains a memory allocation vulnerability in rdg_receive_packet that allows a malicious RD Gateway to force a 2 GiB client allocation before tunnel authentication. Attackers can send an eight-byte RDG header declaring packet length 0x7FFFFFFF to trigger pre-authentication memory exhaustion and denial of service.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121399
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121399
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121399
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-121399
Ubuntu:24.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121399
Ubuntu:26.04:LTS	freerdp3	no fix listed	UBUNTU-CVE-2026-121399
Ubuntu:26.10	freerdp3	no fix listed	UBUNTU-CVE-2026-121399

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	0 – before 3.32.2

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

References

GitHub Security Advisory (GHSA-4vh4-3pc3-32p7) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Memory Exhaustion via RD Gateway Packet Length third-party-advisory