CVE-2026-22852

CRITICAL

FreeRDP < 3.20.1 - Heap Buffer Overflow via Audio Input Format List Processing

Title source: llm

Description

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a malicious RDP server can trigger a heap-buffer-overflow write in the FreeRDP client when processing Audio Input (AUDIN) format lists. audin_process_formats reuses callback->formats_count across multiple MSG_SNDIN_FORMATS PDUs and writes past the newly allocated formats array, causing memory corruption and a crash. This vulnerability is fixed in 3.20.1.

References (2)

Core 2

Core References

Exploit, Vendor Advisory x_refsource_confirm

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9chc-g79v-4qq4

Release Notes x_refsource_misc

https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1

Scores

CVSS v3 9.8

EPSS 0.0011

EPSS Percentile 29.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation poc

Automatable no

Technical Impact total

Details

CWE

CWE-787

Status published

Products (1)

freerdp/freerdp < 3.20.1

Published Jan 14, 2026

Tracked Since Feb 18, 2026