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ImageMagick CVE-2026-56376

| EUVDEUVD-2026-38440 MEDIUM
Use After Free (CWE-416)
2026-06-23 VulnCheck GHSA-8g9f-ccmr-vfvg
Use After Free Denial Of Service Memory Corruption Imagemagick Red Hat Suse
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/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
3.7 LOW

Network-reachable via image upload, but AC:H due to required allocation failure; no auth needed; impact is availability only.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
6.5 MEDIUM
AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Red Hat
3.7 LOW
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
Jun 23, 2026 - 14:17 EUVD
Source Code Evidence Fetched
Jun 23, 2026 - 13:11 vuln.today
Analysis Generated
Jun 23, 2026 - 13:11 vuln.today

DescriptionCVE.org

ImageMagick before 7.1.2-15 and 6.9.13-40 contains a heap use-after-free in the meta coder: when memory allocation fails, a single byte is written to a stale pointer. Remote attackers can trigger it by processing specially crafted image files, causing a denial of service.

AnalysisAI

Heap use-after-free in ImageMagick's meta coder allows remote attackers to crash the process by submitting a specially crafted image file that triggers a memory allocation failure, causing a single byte write to a stale (freed) pointer. Affected versions are ImageMagick before 7.1.2-15 and 6.9.13-40, as well as Magick.NET NuGet wrapper packages before 14.10.3. No public exploit identified at time of analysis and the vulnerability is not listed in CISA KEV; the CVSS 4.0 score of 6.3 with AC:H and AT:P reflects that reliable exploitation requires specific memory allocation failure conditions rather than straightforward request-and-crash triggering.

Technical ContextAI

ImageMagick (CPE: cpe:2.3:a:imagemagick:imagemagick) is a widely deployed open-source image processing library and tool suite. The vulnerability resides in its 'meta coder' - a component responsible for handling certain image format metadata. CWE-416 (Use After Free) describes the root cause: when an internal heap allocation fails during meta coder processing, error handling code writes a single byte to a pointer that now references freed heap memory. The AddressSanitizer output in the GHSA advisory confirms a WRITE of size 1 on a heap-use-after-free address, establishing that the freed buffer is still reachable and writable at the point of the write. This pattern can manifest as a crash (denial of service) or, in theory, memory corruption - though the reported and CVSS-assessed impact is limited to availability.

RemediationAI

Upgrade ImageMagick to version 7.1.2-15 or later on the 7.x branch, or to 6.9.13-40 or later on the 6.x branch. The upstream fix is available via commit f5049954f12c6fcf090a776767526d2a4708d58b (https://github.com/ImageMagick/ImageMagick/commit/f5049954f12c6fcf090a776767526d2a4708d58b). For .NET consumers, upgrade any affected Magick.NET NuGet packages (Magick.NET-Q16-AnyCPU, Magick.NET-Q16-HDRI-AnyCPU, Magick.NET-Q16-HDRI-OpenMP-arm64, Magick.NET-Q16-HDRI-OpenMP-x64) to version 14.10.3 or later. As a compensating control where patching is not immediately possible, restrict the file types and sources permitted to reach ImageMagick image processing pipelines - specifically, block processing of untrusted or externally-submitted files through the meta coder by using ImageMagick's policy.xml to disable or restrict the META coder (e.g., adding a deny policy for 'META' coder). Note that disabling coders may break legitimate use cases if meta-format images are expected. See the advisory at https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-2gq3-ww97-wfjm.

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Same weakness CWE-416 – Use After Free

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CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8

Same technique Use After Free

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8
CVE-2012-4969 HIGH POC
8.1

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-56376 vulnerability details – vuln.today
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