---
id: "CVE-2026-112279"
kind: "vulnerability"
aliases: ["CVE-2026-112279"]
title: "rdesktop: malicious RDP server crashes client via bitmap cache read"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["linux", "package", "rdesktop", "rdp-client"]
not_affected_if: ["no-rdesktop-installed", "trusted-rdp-servers-only"]
published_at: "2026-10-19T14:17:05+00:00"
first_seen_at: "2026-10-23T21:57:18+00:00"
updated_at: "2026-10-25T03:34:58+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112279", "first_seen_at": "2026-10-23T21:57:18+00:00"}]
---

# rdesktop: malicious RDP server crashes client via bitmap cache read

rdesktop through 1.9.0 has a heap out-of-bounds read in process_bmpcache2() in orders.c. A malicious RDP server can send crafted revision-2 bitmap cache orders that make the client memcpy() past its receive buffer, crashing it.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `rdesktop -version` or check the installed package version against `1.9.0`
- unknown

## Fix

- Upgrade rdesktop past `1.9.0` once a fixed release is available; unknown whether a patched version exists
- Until then, only connect to RDP servers you trust

## Timeline

- 2026-10-23T21:57:18+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112279

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_