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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Rdesktop Subscribe
Rdesktop Subscribe

No data.

No data.

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No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/rdesktop/rdesktop/blob/v1.9.0/orders.c cve-icon cve-icon
https://github.com/rdesktop/rdesktop/issues/436 cve-icon cve-icon
https://github.com/rdesktop/rdesktop/pull/437 cve-icon cve-icon
https://hackmd.io/@haindpwn/rdesktop-bitmap-decompress-oob-read cve-icon cve-icon cve-icon
https://www.vulncheck.com/advisories/rdesktop-through-1.9.0-heap-out-of-bounds-read-via-process-bmpcache2 cve-icon cve-icon
History

Mon, 19 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 19 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description 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.
Title rdesktop through 1.9.0 Heap Out-of-Bounds Read via process_bmpcache2
First Time appeared Rdesktop
Rdesktop rdesktop
Weaknesses CWE-125
CPEs cpe:2.3:a:rdesktop:rdesktop:*:*:*:*:*:*:*:*
Vendors & Products Rdesktop
Rdesktop rdesktop
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-19T17:56:06.184Z

Reserved: 2026-10-19T13:25:30.235Z

Link: CVE-2026-112279

cve-icon Vulnrichment

Updated: 2026-10-19T17:55:53.201Z

cve-icon NVD

Status : Deferred

Published: 2026-10-19T14:17:05.977

Modified: 2026-10-19T21:14:14.150

Link: CVE-2026-112279

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-19T15:45:17Z

Weaknesses