Name: CVE-2026-91958: 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-2026-91958, CWE-125, CVSS 6.6, EPSS 0.00197

FreeRDP versions before 3.31.0 fail to validate MonitorIds array values when parsing RDP connection files, allowing unbounded array indexing in xf_detect_monitors. Attackers can craft a malicious RDP file with an out-of-range selectedmonitors value to trigger out-of-bounds heap read and write operations when opened in xfreerdp.

CVSS Details

CVSS 4.0 Base Score: 6.9 (MEDIUM)
CVSS 4.0 Vector: (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/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: 6.6
CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Amazon Linux Ami 2	—	Upgrade freerdp-debuginfoUpgrade freerdp-develUpgrade freerdpUpgrade libwinpr-develUpgrade libwinprUpgrade freerdp-libs	Oct 19, 2026	Oct 19, 2026
Amazon_linux_2023	—	Upgrade libwinpr-develUpgrade freerdpUpgrade freerdp-debuginfoUpgrade freerdp-debugsourceUpgrade freerdp-develUpgrade libwinpr-debuginfoUpgrade freerdp-libs-debuginfoUpgrade freerdp-serverUpgrade freerdp-libsUpgrade libwinprUpgrade freerdp-server-debuginfo	Sep 30, 2026	Sep 15, 2026
Ubuntu	—	Upgrade freerdp3	Sep 22, 2026	Sep 16, 2026

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CVSS Details

Covered by Rapid7

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