Crash or zero-byte write via stale pointer
Published Jul 10, 2026 · Updated Jul 10, 2026
Use-after-free in ImageMagick 6 before 6.9.13-40 and ImageMagick 7 before 7.1.2-15 allows attackers to crash image-processing applications. When allocation fails while decoding a crafted PDB file, the decoder retains a freed pointer and writes one zero byte through that stale reference. Exploitation requires a PDB input that reaches the decoder and an allocation-failure condition; the reported consequence is a process crash or one zero-byte write, not arbitrary code execution.
Summary
What happened
Use-after-free in ImageMagick 6 before 6.9.13-40 and ImageMagick 7 before 7.1.2-15 allows attackers to crash image-processing applications. When allocation fails while decoding a crafted PDB file, the decoder retains a freed pointer and writes one zero byte through that stale reference. Exploitation requires a PDB input that reaches the decoder and an allocation-failure condition; the reported consequence is a process crash or one zero-byte write, not arbitrary code execution.
The record
- CVE
- CVE-2026-56373
- Published
- Jul 10, 2026
- Updated
- Jul 10, 2026
- Vendor
- ImageMagick Studio LLC
- Product
- ImageMagick
- Classifications
- CWE-416
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 10, 2026CVE publishedPublication date reported by the CVE source.
- Jul 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <6.9.13-40
- Affected versionversion=0 <7.1.2-15
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo