---
id: CVE-2026-112277
title: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_plane
summary: >-
  rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in
  process_plane() in bitmap.c that allows malicious RDP servers to crash clients
  by sending malformed 32 bpp compressed bitmaps. Attackers can declare a large
  bitma…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-125
vendor: rdesktop
product: rdesktop
affected:
  - rdesktop <= 1.9.0
published: '2026-10-19'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T13:55:23.436Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112277'
references:
  - url: 'https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read'
  - url: 'https://github.com/rdesktop/rdesktop/issues/436'
  - url: 'https://github.com/rdesktop/rdesktop/pull/437'
  - url: 'https://github.com/rdesktop/rdesktop/blob/v1.9.0/bitmap.c'
  - url: >-
      https://www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via-process-plane
    label: >-
      VulnCheck Advisory: rdesktop through 1.9.0 Heap Out-of-Bounds Read via
      process_plane
tags:
  - cve.org
ingestedAt: '2026-10-19T14:30:01.072Z'
---

## Overview

rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_plane() in bitmap.c that allows malicious RDP servers to crash clients by sending malformed 32 bpp compressed bitmaps. Attackers can declare a large bitmap geometry with a short compressed body in bitmap update PDUs or bitmap cache orders, causing unbounded reads past the receive buffer and denial of service.

## Affected

- `rdesktop <= 1.9.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.