Buffer overflow in Freerdp
CVE-2026-22852
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.004 (33.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 34th percentile — 33.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000
Affected products
- Freerdp — versions < 3.20.1
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-9chc-g79v-4qq4 (Exploit, Vendor Advisory)
- github.com/FreeRDP/FreeRDP/releases/tag/3.20.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-22852?
- CVE-2026-22852 is a critical-severity vulnerability in Freerdp, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-01-14.
- How severe is CVE-2026-22852?
- Critical severity. CVSS v3 base score is 9.8 out of 10.