{"id":"CVE-2026-91958","title":"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","summary":"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 selectedmon…","severity":"medium","cvss":6.6,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H","cwe":["CWE-125","CWE-787"],"vendor":"FreeRDP","product":"FreeRDP","affected":["FreeRDP >= 3.11.0 < 3.31.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:17:00.597","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-91958","references":[{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-23pf-q83q-x45r","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/freerdp-3.11.0-through-3.30.0-heap-buffer-overflow-via-monitor-index","label":"disclosure@vulncheck.com"},{"url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-23pf-q83q-x45r","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91958.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-91958"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2533958"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-91958"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91958"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T15:59:07.176927Z"},"ingestedAt":"2026-09-15T15:39:12.918Z","epss":0.00199,"epssPercentile":0.10058,"slug":"CVE-2026-91958","body":"## Overview\n\nFreeRDP 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91958.json)","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":36.3,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":204280,"id":"CVE-2026-91958","ts":1789490444499,"field":"exploit_available","old":"false","new":"true"}]}