rdesktop up to 1.9.0 Bitmap Processing bitmap.c process_plane out-of-bounds

Summaryinfo

A vulnerability described as problematic has been identified in rdesktop up to 1.9.0. This vulnerability affects the function process_plane of the file bitmap.c of the component Bitmap Processing. Executing a manipulation can lead to out-of-bounds. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is tracked as CVE-2026-112277. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in rdesktop up to 1.9.0 and classified as problematic. This vulnerability affects the function process_plane of the file bitmap.c of the component Bitmap Processing. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at hackmd.io. This vulnerability was named CVE-2026-112277 since 10/19/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Name

• rdesktop

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9.0

License

• open-source

Support

• end of life

CPE 2.3info

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• 🔒
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CPE 2.2info

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• 🔒

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