Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91951FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc

Medium 6.5

In plain English

A medium-severity security flaw in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.4%top 67.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

FreeRDP versions before 3.31.0 contain an out-of-bounds write vulnerability in the urbdrc client channel's urb_send_current_frame_number_result() function. A malicious RDP server can send a crafted 28-byte USB redirection message to trigger a 4-byte write past the allocated 16-byte buffer, causing denial of service when verbose asserts are enabled.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	freerdp3	no fix listed	DEBIAN-CVE-2026-91951
Debian:14	freerdp3	3.31.0+dfsg-1	DEBIAN-CVE-2026-91951
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-91951
Ubuntu:24.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-91951
Ubuntu:26.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-91951

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	3.14.0 – before 3.31.0

Weakness: CWE-617 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-h5w2-q35j-443h) vendor-advisory
VulnCheck Advisory: FreeRDP 3.14.0 through 3.30.0 Out-of-bounds Write via urbdrc third-party-advisory