CVE-2026-56367: ImageMagick - Heap Out-of-Bounds Read in PSB RLE Decoding

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-21 · updated 2026-06-26
Weakness: CWE-125

Description

ImageMagick before 7.1.2-15 and 6.9.x before 6.9.13-40 contains an integer overflow in the PSB (PSD v2) RLE decoding path (ReadPSDChannelRLE in coders/psd.c) that causes a heap out-of-bounds read on 32-bit builds. Processing a crafted PSB file can lead to information disclosure or a crash.

Affected products

ImageMagick: from 6.9.0-0 before 6.9.13-40; from 7.1.2-0 before 7.1.2-15 — fixed in 6.9.13-40, 7.1.2-15

How to fix

Upgrade to a fixed version: ImageMagick 6.9.13-40, 7.1.2-15. Check the vendor advisory for mitigations.

References

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-273h-m46v-96q4
https://www.vulncheck.com/advisories/imagemagick-heap-out-of-bounds-read-in-psb-rle-decoding

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