Application crash via overflowing JNX buffer-size calculation
Published Jul 30, 2026 · Updated Jul 30, 2026
Integer overflow in ImageMagick before 6.9.13-52 and 7.1.2-27 allows local users to crash 32-bit builds by processing large JNX files. The JNX decoder computes a buffer size with overflowing 32-bit arithmetic, after which heap writes exceed the allocated buffer. Exploitation requires attacker-controlled JNX input to be processed by a 32-bit build; no confidentiality or integrity impact is published.
Summary
What happened
Integer overflow in ImageMagick before 6.9.13-52 and 7.1.2-27 allows local users to crash 32-bit builds by processing large JNX files. The JNX decoder computes a buffer size with overflowing 32-bit arithmetic, after which heap writes exceed the allocated buffer. Exploitation requires attacker-controlled JNX input to be processed by a 32-bit build; no confidentiality or integrity impact is published.
The record
- CVE
- CVE-2026-62946
- Published
- Jul 30, 2026
- Updated
- Jul 30, 2026
- Vendor
- ImageMagick Studio LLC
- Product
- ImageMagick
- Classifications
- CWE-190, T1499.004
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 30, 2026CVE publishedPublication date reported by the CVE source.
- Jul 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 6.9.13-52
- Affected versionversion=< 7.1.2-27
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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