Vulnerability · Published Nov 4, 2026 · Assigned by VulnCheck

CVE-2026-121954FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec

Medium 6.5

In plain English

A medium-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 0.4% (higher than 29% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 71.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.32.2 has a heap out-of-bounds write in the planar codec because freerdp_bitmap_planar_context_reset commits new dimensions before buffer reallocation succeeds, and a failed ResetGraphics is only logged. A malicious RDP server can send an oversized ResetGraphics PDU, then a GFX PLANAR command, to corrupt client heap memory and crash the client.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	freerdp2	no fix listed	DEBIAN-CVE-2026-121954
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-121954
Debian:14	freerdp3	3.32.2+dfsg-1	DEBIAN-CVE-2026-121954

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:H/I:N/A:N

References

GitHub Security Advisory (GHSA-fg78-v8j5-8697) vendor-advisory
VulnCheck Advisory: FreeRDP before 3.32.2 Heap Out-of-Bounds Write in Planar Codec third-party-advisory