CVE-2026-40310

Image-processing interruption via invalid JP2 sampling index

Published Apr 13, 2026 · Updated Apr 13, 2026

Heap out-of-bounds write in ImageMagick 7 before 7.1.2-19 and ImageMagick 6 before 6.9.13-44 allows local users to interrupt JP2 encoding. WriteJP2Image passes sampling-factor values below one into the OpenJPEG subsampling_dx and subsampling_dy parameters instead of clamping them to one. Exploitation requires a user to supply an invalid sampling index during JP2 encoding, and the published impact is limited to service interruption.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap out-of-bounds write in ImageMagick 7 before 7.1.2-19 and ImageMagick 6 before 6.9.13-44 allows local users to interrupt JP2 encoding. WriteJP2Image passes sampling-factor values below one into the OpenJPEG subsampling_dx and subsampling_dy parameters instead of clamping them to one. Exploitation requires a user to supply an invalid sampling index during JP2 encoding, and the published impact is limited to service interruption.

The record

CVE
CVE-2026-40310
Published
Apr 13, 2026
Updated
Apr 13, 2026
Vendor
ImageMagick Studio LLC
Product
ImageMagick
Classifications
CWE-787, CWE-122
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 13, 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.

  1. Affected versionversion=< 6.9.13-44
  2. Affected versionversion=< 7.1.2-19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ImageMagick Studio LLC · ImageMagickversion=< 6.9.13-44; version=< 7.1.2-19

Published CVSS scores

5.5GitHub, Inc.CVSS: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-122Heap-based Buffer Overflow

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