---
id: CVE-2026-112279
title: rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2
summary: >-
  rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in
  process_bmpcache2() in orders.c that allows malicious RDP servers to crash
  clients via crafted revision-2 bitmap cache orders. Attackers can send an
  uncompressed …
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: '2026-10-19T13:55:24.937Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-112279'
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/orders.c'
  - url: >-
      https://www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via-process-bmpcache2
    label: >-
      VulnCheck Advisory: rdesktop through 1.9.0 Heap Out-of-Bounds Read via
      process_bmpcache2
tags:
  - cve.org
ingestedAt: '2026-10-19T14:30:01.071Z'
---

## Overview

rdesktop through 1.9.0 contains a heap out-of-bounds read vulnerability in process_bmpcache2() in orders.c that allows malicious RDP servers to crash clients via crafted revision-2 bitmap cache orders. Attackers can send an uncompressed order with large width/height or an underflowing mode nibble and short payload, causing memcpy() 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.