Resource exhaustion in Imagemagick
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.005 (38.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/ImageMagick/ImageMagick/security/advisories/GHSA-4jv7-q6xw-6f4x (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/imagemagick-before-7.1.2-30-memory-leak-via-msl-de… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-86421?
- CVE-2026-86421 is a low-severity vulnerability in Imagemagick, classified under Uncontrolled Resource Consumption. CVSS score: 3.7/10. Published 2026-09-07.
- How severe is CVE-2026-86421?
- Low severity. CVSS v3 base score is 3.7 out of 10.