What is CVE-2026-40183?

CVE-2026-40183 is a medium-severity vulnerability in Imagemagick, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-04-13.

How severe is CVE-2026-40183?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Imagemagick

CVE-2026-40183

ImageMagick is free and open-source software used for editing and manipulating digital images. In versions below 7.1.2-19, the JXL encoder has an heap write overflow when a user specifies that the image should be encoded as 16 bit floats…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (0.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

Affected products

Imagemagick — versions < 7.1.2-19

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jvgr-9ph5-m8v4 (x_refsource_CONFIRM)
https://github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19 (x_refsource_MISC)
https://github.com/dlemstra/Magick.NET/releases/tag/14.12.0 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40183?: CVE-2026-40183 is a medium-severity vulnerability in Imagemagick, classified under Heap-based Buffer Overflow. CVSS score: 5.5/10. Published 2026-04-13.
How severe is CVE-2026-40183?: Medium severity. CVSS v3 base score is 5.5 out of 10.