Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck

CVE-2026-91945FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR

Medium 6.5

In plain English

A medium-severity out-of-bounds read in FreeRDP from FreeRDP. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.6%top 52.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:14	freerdp3	3.31.0+dfsg-1	DEBIAN-CVE-2026-91945
Ubuntu:22.04:LTS	freerdp2	no fix listed	UBUNTU-CVE-2026-91945
Ubuntu:24.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.24.04.1	UBUNTU-CVE-2026-91945
Ubuntu:26.04:LTS	freerdp3	3.31.0+dfsg-0ubuntu0.26.04.1	UBUNTU-CVE-2026-91945

Affected products (as reported)

Vendor	Product	Versions
FreeRDP	FreeRDP	3.28.0 – before 3.31.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

GitHub Security Advisory (GHSA-q65v-4w7q-hx3r) vendor-advisory
Patch Commit patch
VulnCheck Advisory: FreeRDP before 3.31.0 Out-of-bounds Read via Smartcard ATR third-party-advisory