{"id":"CVE-2026-91958","summary":"FreeRDP 3.11.0 through 3.30.0 Heap Buffer Overflow via Monitor Index","details":"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.","aliases":["GHSA-23pf-q83q-x45r"],"modified":"2026-09-17T03:47:20.698705733Z","published":"2026-09-15T15:18:13.294Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91958.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-125"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91958.json"},{"type":"ADVISORY","url":"https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-23pf-q83q-x45r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-91958"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/freerdp-3.11.0-through-3.30.0-heap-buffer-overflow-via-monitor-index"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/freerdp/freerdp","events":[{"introduced":"4312666c8f89cb5464fc6e79423d1d7e33683ebe"},{"fixed":"aa8650b300aa4cabd85d9c72b431301509b9043f"}],"database_specific":{"source":["AFFECTED_FIELD","DESCRIPTION"],"extracted_events":[{"introduced":"3.11.0"},{"fixed":"3.31.0"},{"introduced":"0"}]}}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91958.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}