CVE-2026-40493CWE-787

SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode

Critical · published April 18, 2026

CVSS v3.1
9.8
EPSS
1%
Percentile
47.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00598 · 47.9th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-04-18T01:41Z
EPSS history
Timeline
  • 18 APR 01:41Z
    SAIL has heap buffer overflow in PSD decoder — bpp mismatch in LAB 16-bit mode
    cvelistv5