# CVE-2026-40493

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## Description

SAIL is a cross-platform library for loading and saving images with support for animation, metadata, and ICC profiles. Prior to commit c930284445ea3ff94451ccd7a57c999eca3bc979, the PSD codec computes bytes-per-pixel (`bpp`) from raw header fields `channels * depth`, but the pixel buffer is allocated based on the resolved pixel format. For LAB mode with `channels=3, depth=16`, `bpp = (3*16+7)/8 = 6`, but the format `BPP40_CIE_LAB` allocates only 5 bytes per pixel. Every pixel write overshoots, causing a deterministic heap buffer overflow on every row. Commit c930284445ea3ff94451ccd7a57c999eca3bc979 contains a patch.

## Key facts

- **CVE ID:** CVE-2026-40493
- **Published:** 2026-04-18
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-787

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40493

## Citation

> AI Analytics. CVE-2026-40493. Retrieved 2026-08-02 from https://api.ai-analytics.org/cve/CVE-2026-40493. Derived from NIST NVD. Licensed CC0.

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