Out-of-bounds Read in Freerdp
CVE-2026-91958
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-23pf-q83q-x45r (Exploit, vendor-advisory, Mitigation, Vendor Advisory)
- www.vulncheck.com/advisories/freerdp-3.11.0-through-3.30.0-heap-buffer-overflow… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-91958?
- CVE-2026-91958 is a medium-severity vulnerability in Freerdp, classified under Out-of-bounds Read. CVSS score: 6.6/10. Published 2026-09-15.
- How severe is CVE-2026-91958?
- Medium severity. CVSS v3 base score is 6.6 out of 10.