CVE-2026-59959

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.

• CWE-369

• https://github.com/HappySeaFox/sail/commit/495660135a4c62e416a1b357a4381dd30069229d
• https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8
• https://github.com/HappySeaFox/sail/tree/v1.0.2
• https://github.com/HappySeaFox/sail/security/advisories/GHSA-5g8g-g347-84m8

Published

Oct 28, 2026

Last Modified

Oct 29, 2026

Status

Deferred

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