What is CVE-2026-40493?

CVE-2026-40493 is a critical-severity vulnerability in Happyseafox Sail, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-04-18.

How severe is CVE-2026-40493?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Happyseafox Sail

CVE-2026-40493

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…

Vulnerability class: Buffer Overflow

EPSS: 0.001 (19.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Happyseafox Sail — versions < c930284445ea3ff94451ccd7a57c999eca3bc979

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

https://github.com/HappySeaFox/sail/security/advisories/GHSA-rcqx-gc76-r9mv (x_refsource_CONFIRM)
https://github.com/HappySeaFox/sail/commit/c930284445ea3ff94451ccd7a57c999eca3bc979 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40493?: CVE-2026-40493 is a critical-severity vulnerability in Happyseafox Sail, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2026-04-18.
How severe is CVE-2026-40493?: Critical severity. CVSS v3 base score is 9.8 out of 10.