CVE-2026-31806 — Heap-based Buffer Overflow in Freerdp

Vendor	Product	Version range	Fixed in
debian	freerdp2	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
debian	freerdp3	< freerdp3 3.24.0+dfsg-1 (forky)	freerdp3 3.24.0+dfsg-1 (forky)
freerdp	freerdp	< 3.24.0	3.24.0
ubuntu	freerdp3	—	—

OSV

CVE-2026-31806: FreeRDP is a free implementation of the Remote Desktop Protocol

osv·2026-03-13·CVSS 9.3

CVE-2026-31806 [CRITICAL] CVE-2026-31806: FreeRDP is a free implementation of the Remote Desktop Protocol FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0

Ubuntu

FreeRDP vulnerabilities

vendor_ubuntu·2026-07-20

CVE-2026-33995 FreeRDP vulnerabilities Title: FreeRDP vulnerabilities Summary: Several security issues were fixed in FreeRDP. It was discovered that FreeRDP contained multiple security issues. An attacker could possibly use these issues to obtain sensitive information, cause FreeRDP to crash, resulting in a denial of service, or execute arbitrary code. Instructions: This update uses a new upstream release, which includes additional bug fixes. In general, a standard system update will make all the necessary changes.

Red Hat

freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages

vendor_redhat·2026-03-13·CVSS 9.3

CVE-2026-31806 [CRITICAL] CWE-131 freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages freerdp: FreeRDP: Arbitrary code execution via crafted Remote Desktop Protocol (RDP) server messages FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, th

Debian

CVE-2026-31806: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0...

vendor_debian·2026·CVSS 9.3

CVE-2026-31806 [CRITICAL] CVE-2026-31806: freerdp2 - FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0... FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent by the RDP server. When the command is handled using NSCodec, the bmp.width and bmp.height values provided by the server are not properly validated against the actual desktop dimensions. A malicious RDP server can supply crafted bmp.width and bmp.height values that exceed the expected surface size. Because these values are used during bitmap decoding and memory operations without proper bounds checking, this can lead to a heap buffer overflow. Since the attacker can also control the associated pixel data transmitted by the server, the overflow may be exploitable to overwrite adjacent heap memory. This vulnerability is fixed in 3.24.0

CVE-2026-31806: FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.24.0, the gdi_surface_bits() function processes SURFACE_BITS_COMMAND messages sent…

Affected

CVSS provenance