Memory disclosure via stale MNG channel sizing
Published Aug 13, 2025 · Updated Aug 13, 2025
Heap-buffer over-read in ImageMagick before 7.1.2-1 allows remote attackers to disclose process memory through a crafted MNG image. ReadOneMNGImage sizes its next and prev magnification buffers before GetAuthenticPixels adds a late alpha channel, then GetPixelRed reads past those allocations. Exploitation requires processing attacker-controlled image content; the over-read can place adjacent heap contents in the generated output.
Summary
What happened
Heap-buffer over-read in ImageMagick before 7.1.2-1 allows remote attackers to disclose process memory through a crafted MNG image. ReadOneMNGImage sizes its next and prev magnification buffers before GetAuthenticPixels adds a late alpha channel, then GetPixelRed reads past those allocations. Exploitation requires processing attacker-controlled image content; the over-read can place adjacent heap contents in the generated output.
The record
- CVE
- CVE-2025-55004
- Published
- Aug 13, 2025
- Updated
- Aug 13, 2025
- Vendor
- ImageMagick Studio LLC
- Product
- ImageMagick
- Classifications
- CWE-122, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 13, 2025CVE publishedPublication date reported by the CVE source.
- Aug 13, 2025Record 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=< 7.1.2-1
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- MNG alpha magnification proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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