Heap-based Buffer Overflow Affecting freerdp package, versions <3.24.0-r0


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
0.04% (14th percentile)

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  • Snyk IDSNYK-ALPINE323-FREERDP-15674653
  • published17 Mar 2026
  • disclosed13 Mar 2026

Introduced: 13 Mar 2026

NewCVE-2026-31806  (opens in a new tab)
CWE-122  (opens in a new tab)

How to fix?

Upgrade Alpine:3.23 freerdp to version 3.24.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream freerdp package and not the freerdp package as distributed by Alpine. See How to fix? for Alpine:3.23 relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1