Information disclosure via undersized wavelet buffer allocation
Published Feb 25, 2026 · Updated Feb 25, 2026
Heap buffer over-read in ImageMagick before 6.9.13-40 and 7.0.0 through 7.1.2-14 allows local users to disclose process memory. WaveletDenoiseImage allocates three column-width pixel planes although its processing requires four, so small images cause reads beyond the heap allocation. Exploitation requires local invocation of wavelet denoising on a crafted small-dimension image; the published impact is limited to confidentiality.
Summary
What happened
Heap buffer over-read in ImageMagick before 6.9.13-40 and 7.0.0 through 7.1.2-14 allows local users to disclose process memory. WaveletDenoiseImage allocates three column-width pixel planes although its processing requires four, so small images cause reads beyond the heap allocation. Exploitation requires local invocation of wavelet denoising on a crafted small-dimension image; the published impact is limited to confidentiality.
The record
- CVE
- CVE-2026-27798
- Published
- Feb 25, 2026
- Updated
- Feb 25, 2026
- Vendor
- ImageMagick Studio LLC
- Product
- ImageMagick
- Classifications
- CWE-125, CWE-126, T1005
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 25, 2026CVE publishedPublication date reported by the CVE source.
- Feb 25, 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=< 6.9.13-40
- Affected versionversion=>= 7.0.0, < 7.1.2-15
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.
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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