CVE-2026-46521

Service interruption via undersized LZMA output buffer

Published Jun 10, 2026 · Updated Jun 10, 2026

Out-of-bounds write in ImageMagick 6 before 6.9.13-48 and ImageMagick 7 before 7.1.2-23 allows local users to interrupt processing. WriteMIFFImage sizes its compression buffer from BZip2 and ZIP maxima but omits LZMAMaxExtent before writing LZMA-compressed MIFF output. Triggering requires a user-involved local workflow that selects LZMA compression for MIFF output; no confidentiality or integrity impact is published.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in ImageMagick 6 before 6.9.13-48 and ImageMagick 7 before 7.1.2-23 allows local users to interrupt processing. WriteMIFFImage sizes its compression buffer from BZip2 and ZIP maxima but omits LZMAMaxExtent before writing LZMA-compressed MIFF output. Triggering requires a user-involved local workflow that selects LZMA compression for MIFF output; no confidentiality or integrity impact is published.

The record

CVE
CVE-2026-46521
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
ImageMagick Studio LLC
Product
ImageMagick
Classifications
CWE-787, CWE-835, CWE-252, CWE-131, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 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.

  1. Affected versionversion=< 6.9.13-48
  2. Affected versionversion=< 7.1.2-23

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ImageMagick Studio LLC · ImageMagickversion=< 6.9.13-48; version=< 7.1.2-23

Published CVSS scores

5.5GitHubCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
CWE-252Unchecked Return Value
CWE-131Incorrect Calculation of Buffer Size
T1499.004Application or System Exploitation

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

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Your stack

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