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CVE-2026-40493

CRITICAL Exploitation: PoC
9.8
CVSS 3.1
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.

Metadata

CVE ID
CVE-2026-40493
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-13 19:50 UTC
Published
2026-04-18 01:41 UTC
Last updated
2026-04-20 16:15 UTC
Primary CWE
CWE-787
CWE-787: Out-of-bounds Write
Vendor / Product
HappySeaFox / sail
Sources
cve.org  ·  NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC — CISA Coordinator
Exploitation
PoC
Automatable
yes
Tech. Impact
total
Affected products (1)
VendorProductPlatformVersions
HappySeaFox sail — < c930284445ea3ff94451ccd7a57c999eca3bc979
Weakness (CWE)
CWESourceDescription
CWE-787 cna CWE-787: Out-of-bounds Write
CVSS scores (1)
ScoreSeverityVersionSourceVector
9.8 CRITICAL 3.1 cna CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
References (2)
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