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
0.03% (10th percentile)

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  • Snyk IDSNYK-ALPINE323-FREERDP-15674658
  • published17 Mar 2026
  • disclosed13 Mar 2026

Introduced: 13 Mar 2026

NewCVE-2026-31883  (opens in a new tab)
CWE-122  (opens in a new tab)
CWE-191  (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, a size_t underflow in the IMA-ADPCM and MS-ADPCM audio decoders leads to heap-buffer-overflow write via the RDPSND audio channel. In libfreerdp/codec/dsp.c, the IMA-ADPCM and MS-ADPCM decoders subtract block header sizes from a size_t variable without checking for underflow. When nBlockAlign (received from the server) is set such that size % block_size == 0 triggers the header parsing at a point where size is smaller than the header (4 or 8 bytes), the subtraction wraps size to ~SIZE_MAX. The while (size > 0) loop then continues for an astronomical number of iterations. This vulnerability is fixed in 3.24.0.

CVSS Base Scores

version 3.1