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Back to active CVEs
Medium · CVSS 4.8CVE-2026-59959

SAIL: WebP decoder division by zero through malformed animated canvas metadataCVE-2026-59959

Answer in brief

CVE-2026-59959 records a Medium severity (CVSS 4.8) vulnerability in SAIL: WebP decoder division by zero through malformed animated canvas metadata. The current sources do not mark it as known exploited. The current feed maps HappySeaFox/sail (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 28, 2026Updated Oct 28, 2026Source checked Oct 28, 2026First seen by HOL Oct 28, 2026Material review Oct 28, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.8
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps HappySeaFox/sail (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
HappySeaFox/sailgeneric<1.0.21.0.2

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for HappySeaFox/sail.
  2. 2Review the reported fix. Update HappySeaFox/sail to 1.0.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 28, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 28, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-369
Source
CVE List V5
Source checked
Oct 28, 2026
References
3 linked sources
Open source record