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ImageMagick EUVDEUVD-2026-42259

| CVE-2026-56362 LOW
Out-of-bounds Read (CWE-125)
2026-07-08 disclosure@vulncheck.com GHSA-m366-rhm3-cx89
Buffer Overflow Information Disclosure Imagemagick
2.1
CVSS 4.0 · Vendor: vulncheck

Severity by source

Vendor (vulncheck) PRIMARY
2.1 LOW
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
3.3 LOW

High privileges and precise allocation-failure timing required; impacts limited to partial heap read and minor availability disruption with no integrity effect.

3.1 AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:L
4.0 AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (vulncheck).

CVSS VectorVendor: vulncheck

CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 08, 2026 - 15:07 vuln.today
Patch available
Jul 08, 2026 - 15:01 EUVD

DescriptionCVE.org

ImageMagick before 7.1.2-15 contains a heap-buffer-overflow read vulnerability in GetPixelIndex caused by OpenPixelCache updating image channel metadata before pixel cache memory allocation. Attackers can trigger memory and disk allocation failures to cause a heap-buffer-overflow read affecting any writer calling GetPixelIndex.

AnalysisAI

Heap-buffer-overflow read in ImageMagick's GetPixelIndex function exposes limited heap memory contents and can cause partial availability impact in affected 6.x and 7.x branches before the patched releases. The root cause is a metadata-allocation race in OpenPixelCache, which updates image channel metadata before confirming successful pixel cache memory allocation, leaving GetPixelIndex to operate on stale channel counts. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain high-privilege access to image processor
Delivery
Submit resource-exhausting crafted image
Exploit
Induce memory or disk allocation failure during OpenPixelCache
Execution
Channel metadata updates before allocation completes
Persist
GetPixelIndex reads out-of-bounds heap region
Impact
Partial heap data disclosure or processing crash
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Vulnerability AssessmentAI

Exploitation Exploitation requires high privilege access to the ImageMagick processing context (PR:H per CVSS 4.0 vector) and the ability to create or influence memory or disk allocation failures on the target system (AT:P - a specific precondition). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 base score of 2.1 accurately reflects a low-priority issue. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A high-privilege user on a shared image processing service submits a crafted image while simultaneously exhausting available memory or disk space on the host, causing OpenPixelCache's pixel buffer allocation to fail after channel metadata has already been updated. GetPixelIndex then performs an out-of-bounds heap read using the stale channel count, potentially leaking a small amount of adjacent heap memory to the caller or crashing the processing thread. …
Remediation Upgrade ImageMagick to version 7.1.2-15 or later on the 7.x branch, or to version 6.9.13-40 or later on the legacy 6.x branch. … Detailed patch versions, workarounds, and compensating controls in full report.
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EUVD-2026-42259 vulnerability details – vuln.today
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