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Description

image-size through 2.0.2 contains a denial of service vulnerability that allows remote attackers to permanently block the Node.js event loop by supplying a specially crafted image buffer with a zero-valued size field in a recognized box-type. Attackers can trigger an infinite loop in the JXL or HEIF image parsers by providing a crafted image containing a box with a size of zero, causing the offset to never advance and permanently hanging the application.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-10 | Updated 2026-06-10 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Product status

Default status
unaffected

1.1.0 (semver)
affected

2.0.0 (semver)
affected

Credits

Joshua Rogers (@MegaManSec) finder

References

joshua.hu/image-size-infinite-loop-dos-vulnerabilities technical-description exploit

web.archive.org/...github.com/image-size/image-size/pull/439 patch

www.vulncheck.com/...ce-via-infinite-loop-in-jxl-heif-parser third-party-advisory

cve.org (CVE-2025-71329)

nvd.nist.gov (CVE-2025-71329)

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