Buffer overflow in Freerdp
CVE-2026-109256
FreeRDP 3.10.0 through 3.32.2 contains a heap buffer overflow in the WinPR png_write_data callback that writes past the buffer after a realloc failure. A malicious RDP clipboard peer can supply a large CF_DIB image that triggers out-of-bounds memcpy during PNG conversion, causing a client crash.
Vulnerability class: Buffer Overflow
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-wf3x-658c-52m5 (vendor-advisory)
- www.vulncheck.com/advisories/freerdp-3.10.0-through-3.32.2-heap-buffer-overflow… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109256?
- CVE-2026-109256 is a medium-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 5.3/10. Published 2026-10-12.
- How severe is CVE-2026-109256?
- Medium severity. CVSS v3 base score is 5.3 out of 10.