Log in Start free

Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91956FreeRDP before 3.31.0 Out-of-Bounds Read via URBDRC

Medium 6.5

In plain English

A medium-severity out-of-bounds read in FreeRDP from FreeRDP. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% 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 66.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

FreeRDP before 3.31.0 contains an out-of-bounds read vulnerability in the URBDRC channel's func_get_ep_desc function that indexes interface arrays by position instead of protocol field InterfaceNumber. A malicious RDP server can send a crafted SELECT_CONFIGURATION message with permuted InterfaceNumber values to read past allocated heap memory and crash the client.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:10freerdp2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:8freerdp2:2.11.7-14.el8_10ALSA-2026:76747
AlmaLinux:9freerdp2:2.11.7-7.el9_8.8ALSA-2026:76755
AlmaLinux:10freerdp-devel2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:8freerdp-devel2:2.11.7-14.el8_10ALSA-2026:76747
AlmaLinux:9freerdp-devel2:2.11.7-7.el9_8.8ALSA-2026:76755
AlmaLinux:10freerdp-libs2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:8freerdp-libs2:2.11.7-14.el8_10ALSA-2026:76747
AlmaLinux:9freerdp-libs2:2.11.7-7.el9_8.8ALSA-2026:76755
AlmaLinux:10freerdp-server2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:10libwinpr2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:8libwinpr2:2.11.7-14.el8_10ALSA-2026:76747
AlmaLinux:9libwinpr2:2.11.7-7.el9_8.8ALSA-2026:76755
AlmaLinux:10libwinpr-devel2:3.10.3-12.el10_2.14ALSA-2026:75570
AlmaLinux:8libwinpr-devel2:2.11.7-14.el8_10ALSA-2026:76747
AlmaLinux:9libwinpr-devel2:2.11.7-7.el9_8.8ALSA-2026:76755
Debian:12freerdp2no fix listedDEBIAN-CVE-2026-91956
Debian:13freerdp3no fix listedDEBIAN-CVE-2026-91956
Debian:14freerdp33.31.0+dfsg-1DEBIAN-CVE-2026-91956
Rocky Linux:10freerdp2:3.10.3-12.el10_2.14RLSA-2026:75570
Rocky Linux:8freerdp2:2.11.7-14.el8_10RLSA-2026:76747
Rocky Linux:9freerdp2:2.11.7-7.el9_8.8RLSA-2026:76755
Ubuntu:22.04:LTSfreerdp2no fix listedUBUNTU-CVE-2026-91956
Ubuntu:24.04:LTSfreerdp33.31.0+dfsg-0ubuntu0.24.04.1UBUNTU-CVE-2026-91956
Ubuntu:26.04:LTSfreerdp33.31.0+dfsg-0ubuntu0.26.04.1UBUNTU-CVE-2026-91956

Affected products (as reported)

VendorProductVersions
FreeRDP FreeRDP 0 – before 3.31.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References