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. This issue has been fixed in version 7.1.2-19.
Vulnerability class: Buffer Overflow
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.002 (8.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Imagemagick — versions < 7.1.2-19
Weakness classification (CWE)
References
- github.com/ImageMagick/ImageMagick/security/advisories/GHSA-jvgr-9ph5-m8v4 (Vendor Advisory)
- github.com/ImageMagick/ImageMagick/releases/tag/7.1.2-19 (Release Notes)
- github.com/dlemstra/Magick.NET/releases/tag/14.12.0 (Release Notes)
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.