CVE-2026-86421: imagemagick DoS — Fix

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.

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CVSS v3.1 Score

3.7

LOW

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

EPSS — Exploit Prediction

0.0044

Probability of exploitation

0.38%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
imagemagick	imagemagick	< 6.9.13-55
imagemagick	imagemagick	7.0.0-0 — 7.1.2-30

References

Advisories & Patches

https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-4jv7-q6xw-6f4x

Other References

https://www.vulncheck.com/advisories/imagemagick-before-7.1.2-30-memory-leak-via-msl-decoder

Frequently Asked Questions

What is CVE-2026-86421? +

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. It has a CVSS v3.1 base score of 3.7 (LOW).

How severe is CVE-2026-86421? +

CVE-2026-86421 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0044, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-86421? +

CVE-2026-86421 affects products from imagemagick, specifically: imagemagick. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-86421? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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