HappySeaFox SAIL up to 0.x XBM Codec xbm.c sail_codec_load_frame_v8_xbm heap-based overflow

Summaryinfo

A vulnerability was found in HappySeaFox SAIL up to 0.x. It has been declared as critical. This vulnerability affects the function sail_codec_load_frame_v8_xbm of the file src/sail-codecs/xbm/xbm.c of the component XBM Codec. Executing a manipulation can lead to heap-based overflow. The identification of this vulnerability is CVE-2026-54692. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in HappySeaFox SAIL up to 0.x. It has been declared as critical. This vulnerability affects the function sail_codec_load_frame_v8_xbm of the file src/sail-codecs/xbm/xbm.c of the component XBM Codec. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to 1.0.0, sail_codec_load_frame_v8_xbm() in src/sail-codecs/xbm/xbm.c allocates the decoded pixel buffer using the X11 one-byte-per-literal layout, but an X10 static short file causes the flat decode loop to write two file-controlled bytes per literal. When ceil(width/8) produces an odd row stride, the X10 literal count includes a padding byte for every row, but the destination has no space for those bytes, so loading the XBM through sail_load_from_file, sail_load_from_memory, or sail_start_loading_* produces a forward heap overwrite that scales with image height. The X11 static char path is not affected. The overwrite can corrupt process state, cause reliable crashes, and potentially enable code execution in a susceptible consuming application. This issue is fixed in version 1.0.0.

The advisory is available at github.com. This vulnerability was named CVE-2026-54692 since 06/16/2026. 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. Technical details are known, but there is no available exploit.

Upgrading to version 1.0.0 eliminates this vulnerability.

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Productinfo

Vendor

• HappySeaFox

Name

• SAIL

Version

• 0.x

Website

• Product: https://github.com/HappySeaFox/sail/

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