Name: CVE-2026-91956: Out-of-bounds Read
Creator: Rapid7
Published: 2026-09-15T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-91956, CWE-125, CVSS 6.5, EPSS 0.00391

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.

CVSS Details

CVSS 4.0 Base Score: 7.1 (HIGH)
CVSS 4.0 Vector: (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X)
CVSS 3.1 Base Score: 6.5
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alma_linux	—	Upgrade libwinpr-develUpgrade freerdpUpgrade freerdp-develUpgrade freerdp-libsUpgrade libwinpr	Oct 11, 2026	Oct 6, 2026
Amazon Linux Ami 2	—	Upgrade libwinprUpgrade libwinpr-develUpgrade freerdpUpgrade freerdp-develUpgrade freerdp-debuginfoUpgrade freerdp-libs	Oct 19, 2026	Oct 19, 2026
Amazon_linux_2023	—	Upgrade freerdpUpgrade freerdp-debugsourceUpgrade libwinpr-develUpgrade freerdp-server-debuginfoUpgrade freerdp-develUpgrade libwinprUpgrade freerdp-libsUpgrade freerdp-libs-debuginfoUpgrade libwinpr-debuginfoUpgrade freerdp-serverUpgrade freerdp-debuginfo	Sep 30, 2026	Sep 15, 2026
Oracle_linux	—	Upgrade freerdp-serverUpgrade libwinpr-develUpgrade freerdpUpgrade freerdp-libsUpgrade libwinprUpgrade freerdp-devel	Oct 22, 2026	Sep 15, 2026
Redhat_linux	—	Upgrade freerdp-libs-debuginfoUpgrade freerdp-libsUpgrade libwinpr-debuginfoUpgrade libwinprUpgrade freerdp-serverNo solution existsUpgrade freerdp-server-debuginfoUpgrade freerdp-debuginfoUpgrade freerdpUpgrade libwinpr-develUpgrade freerdp-debugsourceUpgrade freerdp-devel	Sep 17, 2026	Sep 15, 2026
Rocky_linux	—	Upgrade libwinpr-debuginfoUpgrade freerdp-serverUpgrade freerdp-libsUpgrade freerdp-develUpgrade freerdp-server-debuginfoUpgrade libwinprUpgrade freerdp-libs-debuginfoUpgrade freerdp-debuginfoUpgrade freerdpUpgrade libwinpr-develUpgrade freerdp-debugsource	Oct 8, 2026	Oct 7, 2026
Ubuntu	—	Upgrade freerdp3	Sep 22, 2026	Sep 16, 2026

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CVSS Details

Covered by Rapid7

Prioritize with Active Threat Intelligence