---
id: CVE-2026-91946
title: >-
  FreeRDP versions before 3.31.0 contain an information disclosure vulnerability
  in the RDPGFX server's ResetGraphics PDU serializer that fails to initialize
  padding bytes in the fixed 340-byte wire format
summary: >-
  FreeRDP versions before 3.31.0 contain an information disclosure vulnerability
  in the RDPGFX server's ResetGraphics PDU serializer that fails to initialize
  padding bytes in the fixed 340-byte wire format. Attackers can receive
  uninitiali…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-908
  - CWE-824
vendor: freerdp
product: freerdp
affected:
  - 'freerdp >= 2.0.0, < 3.31.0'
patched:
  - freerdp 3.31.0
published: '2026-09-15'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T12:14:07.923'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91946'
references:
  - url: >-
      https://github.com/FreeRDP/FreeRDP/commit/483c9388119f06bac420d92053cff9ef94e83bea
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-r7jx-j9h7-j4xj'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/freerdp-before-3.31.0-information-disclosure-via-rdpgfx-resetgraphics
    label: disclosure@vulncheck.com
  - url: 'https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-r7jx-j9h7-j4xj'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91946.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-91946'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2533913'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-91946'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-91946'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
epss: 0.0046
epssPercentile: 0.37299
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-21T19:03:18.599174Z'
ingestedAt: '2026-09-15T15:39:12.921Z'
---

## Overview

FreeRDP versions before 3.31.0 contain an information disclosure vulnerability in the RDPGFX server's ResetGraphics PDU serializer that fails to initialize padding bytes in the fixed 340-byte wire format. Attackers can receive uninitialized heap memory including live pointers and GLib function addresses transmitted in the PDU, defeating heap ASLR and disclosing the GLib module base address.

## Affected

- `freerdp >= 2.0.0, < 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, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-91946.json)