CVE-2026-40493

Basic Information

Severity CRITICAL
Base Score 9.8
CNA GitHub_M
Published Date 2026-04-17 21:41:14 UTC
Last Modified 2026-04-17 21:41:14 UTC
CVE.org Link https://www.cve.org/CVERecord?id=CVE-2026-40493
NVD https://nvd.nist.gov/vuln/detail/CVE-2026-40493

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.

Affected Products

Vendor Product
happyseafox sail