HappySeaFox Sail up to 1.0.1 WebP Decoder webp.c sail_codec_load_init_v8_webp divide by zero

Summaryinfo

A vulnerability, which was classified as problematic, was found in HappySeaFox Sail up to 1.0.1. This affects the function sail_codec_load_init_v8_webp of the file src/sail-codecs/webp/webp.c of the component WebP Decoder. Executing a manipulation can lead to divide by zero. This vulnerability is handled as CVE-2026-59959. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in HappySeaFox Sail up to 1.0.1. This vulnerability affects the function sail_codec_load_init_v8_webp of the file src/sail-codecs/webp/webp.c of the component WebP Decoder. The manipulation with an unknown input leads to a divide by zero vulnerability. The CWE definition for the vulnerability is CWE-369. The product divides a value by zero. As an impact it is known to affect availability. CVE summarizes:

SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to version 1.0.2, the built-in WebP decoder can crash during loader initialization when processing a malformed animated WebP file with inconsistent container or `ANMF` frame metadata. In `sail_codec_load_init_v8_webp()` in `src/sail-codecs/webp/webp.c`, `WebPDemuxGetI` with `WEBP_FF_CANVAS_WIDTH` can return a zero `image_local->width`, which is then used as a divisor when calculating `bytes_per_pixel` from the image row size. The division happens before frame decoding and before generic image skeleton validation in `src/sail/sail_advanced.c`, causing an arithmetic fault and process termination. Applications accepting untrusted WebP images can consequently suffer denial of service; builds must include the affected WebP codec. This issue is fixed in version 1.0.2.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-59959 since 07/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 373454 (Linux Distros Unpatched Vulnerability : CVE-2026-59959), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (373454). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• HappySeaFox

Name

• Sail

Version

• 1.0.0
• 1.0.1

Website

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

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Once again VulDB remains the best source for vulnerability data.

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