Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.006
EPSS Ranking 45.8%
CVSS Severity
CVSS v3 Score 6.5
References
- https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r
- https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr
- https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r