---
id: CVE-2026-91945
title: >-
  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
summary: >-
  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 PA…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-125
vendor: freerdp
product: freerdp
affected:
  - 'freerdp >= 3.28.0, < 3.31.0'
patched:
  - freerdp 3.31.0
published: '2026-09-15'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T12:13:45.970'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91945'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/9626564421df72c84f891afdbc0b20bf702f369f
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.31.0-out-of-bounds-read-via-smartcard-atr
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-q65v-4w7q-hx3r'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91945.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-91945'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2533965'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-91945'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91945'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.0053
epssPercentile: 0.42341
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T15:51:49.870990Z'
ingestedAt: '2026-09-15T15:39:12.923Z'
---

## Overview

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

- `freerdp >= 3.28.0, < 3.31.0`

## Remediation

Upgrade past the affected range:

- `freerdp 3.31.0`

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91945.json)