Out-of-bounds Read in Freerdp
CVE-2026-91945
FreeRDP versions before 3.31.0 contain an out-of-bounds read vulnerability in smartcard response decoders that fail to validate ATR length fields against fixed inline arrays. Authenticated RDP clients can send oversized ATR lengths in PAKID_CORE_DEVICE_IOCOMPLETION responses to trigger reads past stack or heap objects, causing process termination.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (47.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r (Exploit, vendor-advisory, Patch, Mitigation, Vendor Advisory)
- github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f (Patch, patch)
- www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smart… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-91945?
- CVE-2026-91945 is a medium-severity vulnerability in Freerdp, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-09-15.
- How severe is CVE-2026-91945?
- Medium severity. CVSS v3 base score is 6.5 out of 10.