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CVE-2026-86421— ImageMagick before 7.1.2-30 Memory Leak via MSL decoder

Quick assessment

Affected

ImageMagick ImageMagick

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 7.1.2-30 之前的 ImageMagick 以及 6.9.13-55 之前的版本中，MSL 图像解码器存在内存泄漏漏洞。攻击者可以构造一个特制的 MSL 图像，触发内存分配但未正确释放，从而导致内存耗尽，引发拒绝服务（DoS）攻击。

CVSS 3.7 · Low Updated Sep 07, 2026

Possible ATT&CK Techniques 1 AI

T1222 · File and Directory Permissions Modification

Affected Version Matrix 4

Vendor	Product	Version Range	Status
ImageMagick	ImageMagick	`< 7.1.2-30`	affected
		`7.1.2-30`	unaffected
		`< 6.9.13-55`	affected
		`6.9.13-55`	unaffected

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Vulnerability Information

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Vulnerability Title

ImageMagick before 7.1.2-30 Memory Leak via MSL decoder

Source: CVE Program / CVE List V5

Vulnerability Description

ImageMagick before 7.1.2-30 and 6.9.13-55 contains a memory leak in the MSL image decoder. A crafted MSL image triggers memory allocation without proper deallocation, allowing an attacker to exhaust memory and cause a denial of service.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Source: CVE Program / CVE List V5

Vulnerability Type

未加控制的资源消耗(资源穷尽)

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
ImageMagick	ImageMagick	0 ~ 7.1.2-30	-
ImageMagick	ImageMagick	0 ~ 6.9.13-55	-

II. Public POCs for CVE-2026-86421

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-86421

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Vendor Advisories for CVE-2026-86421 (2)

🔗 Memory Leak in MSL decoder · Advisory · ImageMagick/ImageMagick · GitHub vendor-advisory
🔗 ImageMagick before 7.1.2-30 Memory Leak via MSL decoder | Advisories | VulnCheck third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-86421

Same Patch Batch · ImageMagick · 2026-09-07 · 6 CVEs total

CVE-2026-86420	3.7 LOW	ImageMagick before 7.1.2-30 Denial of Service Memory Budget
CVE-2026-86422	3.3 LOW	ImageMagick before 7.1.2-30 Path Policy TOCTOU Symlink Race
CVE-2026-86425	3.3 LOW	ImageMagick before 7.1.2-30 Heap-use-after-free via Layer
CVE-2026-86423	3.3 LOW	ImageMagick before 7.1.2-30 Heap-use-after-free via GetList
CVE-2026-86424	2.5 LOW	ImageMagick before 7.1.2-30 Path Traversal via TOCTOU Symlink Race

IV. Related Vulnerabilities

Same product: ImageMagick

Same vendor: ImageMagick

Same weakness: CWE-400

V. Comments for CVE-2026-86421

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-86421— ImageMagick before 7.1.2-30 Memory Leak via MSL decoder

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 4

I. Basic Information for CVE-2026-86421

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-86421

III. Intelligence Information for CVE-2026-86421

Vendor Advisories for CVE-2026-86421 (2)

Same Patch Batch · ImageMagick · 2026-09-07 · 6 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-86421

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