CVE-2026-109246CWE-191

CVE-2026-109246

Medium · published October 12, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
23.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
7.1 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00313 · 23.0th percentile
Weakness
CWE-191 · Integer Underflow (Wrap or Wraparound)
Published
2026-10-12T21:17Z
References (3)
https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6vjv-4hm3-6698 · [email protected]https://www.vulncheck.com/advisories/freerdp-before-3.32.0-shadow-server-divide-by-zero-via-frame-acknowledge-pdu · [email protected]https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6vjv-4hm3-6698 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 16:04Z
    FreeRDP before 3.32.0 Shadow Server Divide-by-Zero via Frame Acknowledge PDU
    cvelistv5
  • 12 OCT 16:04Z
    FreeRDP before 3.32.0 Shadow Server Divide-by-Zero via Frame Acknowledge PDU
    cvelistv5