Heap-based Buffer Overflow Affecting libwinpr-devel package, versions <2:2.11.7-7.el9_8.3


Severity

Recommended
medium

Based on AlmaLinux security rating.

Threat Intelligence

EPSS
0.32% (24th percentile)

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  • Snyk IDSNYK-ALMALINUX9-LIBWINPRDEVEL-16750144
  • published18 May 2026
  • disclosed19 May 2026

Introduced: 18 May 2026

CVE-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 AlmaLinux:9 libwinpr-devel to version 2:2.11.7-7.el9_8.3 or higher.
This issue was patched in ALSA-2026:19358.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libwinpr-devel package and not the libwinpr-devel package as distributed by AlmaLinux. See How to fix? for AlmaLinux:9 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