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CVE-2026-59959

CVE-2026-59959 · SAIL: WebP decoder division by zero through malformed animated canvas metadata

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.8 · Medium · EPSS 0.1% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • sail

    Versions
    • < 1.0.2: Affected

    No fix published

  • sail Debian:13

    Versions
    • 0.9.10-1
    • 0.9.10-2
    • 0.9.10-3
    • 0.9.8-1
    • 0.9.8-1+deb13u1
    • 0.9.9-1
    • 1.2.0-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • sail Debian:14

    Versions
    • 0.9.10-1
    • 0.9.10-2
    • 0.9.10-3
    • 0.9.8-1
    • 0.9.9-1
    Affected ranges
    • ECOSYSTEM: < 1.2.0-1

    Update to 1.2.0-1

Original sources

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