Buffer overflow in Freerdp
CVE-2026-121954
FreeRDP before 3.32.2 has a heap out-of-bounds write in the planar codec because freerdp_bitmap_planar_context_reset commits new dimensions before buffer reallocation succeeds, and a failed ResetGraphics is only logged. A malicious RDP server can send an oversized ResetGraphics PDU, then a GFX PLANAR command, to corrupt client heap memory and crash the client.
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:H/I:N/A:N.
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-fg78-v8j5-8697 (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.2-heap-out-of-bounds-write-in-… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-121954?
- CVE-2026-121954 is a medium-severity vulnerability in Freerdp, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2026-11-04.
- How severe is CVE-2026-121954?
- Medium severity. CVSS v3 base score is 6.5 out of 10.