Buffer overflow in Freerdp
CVE-2026-121950
FreeRDP before 3.32.2 does not check the product of surface dimensions in gdi_CreateSurface when handling an RDPGFX CREATE_SURFACE PDU, causing an integer wrap and heap buffer overflow on 32-bit builds and an approximately 4 GiB allocation on 64-bit builds. A malicious RDP server can send a CREATE_SURFACE PDU with width and height 32766 to a connecting client to corrupt heap memory or cause a denial of service.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/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-f53w-3364-jr35 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-overflow-via-rdpgfx-cre… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121950?
- CVE-2026-121950 is a medium-severity vulnerability in Freerdp, classified under Heap-based Buffer Overflow. CVSS score: 6.5/10. Published 2026-11-04.
- How severe is CVE-2026-121950?
- Medium severity. CVSS v3 base score is 6.5 out of 10.