What’s Vulnerable › Vulnerabilities

CVE-2026-22852: FreeRDP has a heap-buffer-overflow in audin_process_formats

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-14 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• FreeRDP: before 3.20.1 — fixed in 3.20.1

How to fix

Upgrade to a fixed version: FreeRDP 3.20.1. Check the vendor advisory for mitigations.

References

• https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9chc-g79v-4qq4

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