CVE-2026-109246

EUVD-2026-97690

12.10.2026, 17:17

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.

Wrap or Wraparound

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
VulnCheck	CNA	6.5 MEDIUM	NETWORK	LOW	LOW	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
freerdp	freerdp	𝑥 < 3.32.0	CNA

Debian Releases

Debian Product

Codename

freerdp2

bookworm

vulnerable

freerdp3

forky	3.32.1+dfsg-1 fixed
sid	3.32.2+dfsg-1 fixed
trixie	vulnerable

Common Weakness Enumeration

CWE-191 - Integer Underflow (Wrap or Wraparound)
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

References

https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-6vjv-4hm3-6698

https://www.vulncheck.com/advisories/freerdp-before-3.32.0-shadow-server-divide-by-zero-via-frame-acknowledge-pdu