Integer overflow in Freerdp
CVE-2026-109246
FreeRDP before 3.32.0 contains a divide-by-zero vulnerability in the freerdp-shadow-cli shadow server: the frame id in a client's Frame Acknowledge PDU is stored without a range check, so the in-flight frame count in shadow_encoder_inflight_frames() can underflow. An authenticated client can acknowledge a frame id one greater than the last frame sent, causing shadow_encoder_create_frame_id() to divide by zero (SIGFPE) and terminate the process, disconnecting all viewers.
Published .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/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-6vjv-4hm3-6698 (vendor-advisory)
- www.vulncheck.com/advisories/freerdp-before-3.32.0-shadow-server-divide-by-zero… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-109246?
- CVE-2026-109246 is a medium-severity vulnerability in Freerdp, classified under Integer Underflow. CVSS score: 6.5/10. Published 2026-10-12.
- How severe is CVE-2026-109246?
- Medium severity. CVSS v3 base score is 6.5 out of 10.