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CVE-2026-56373: ImageMagick - Use-After-Free Write in PDB Decoder

• Severity: medium (CVSS 5.3 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: 2026-07-10 · updated 2026-10-29
• Weakness: CWE-416

Description

ImageMagick before 7.1.2-15 contains a use-after-free vulnerability in the PDB decoder that uses a stale pointer when memory allocation fails. Attackers can trigger this vulnerability by processing malicious PDB files to cause crashes or write a single zero byte to freed memory.

Affected products

• ImageMagick: before 6.9.13-40; from 7.0.0-0 before 7.1.2-15 — fixed in 6.9.13-40, 7.1.2-15
• ImageMagick: from 7.0.0 before 7.1.2-15 — fixed in 7.1.2-15

How to fix

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

References

• https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-3j4x-rwrx-xxj9
• https://www.vulncheck.com/advisories/imagemagick-use-after-free-write-in-pdb-decoder

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