image-size: JXL and HEIF parsers allow denial of service through infinite loops
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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | image-size | >= 1.2.0, < 2.0.3 | 2.0.3 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-71329
- https://codeberg.org/image-size/image-size/commit/e6e83a5578961de81f6d5834d90fb7430d8f29a5
- https://github.com/image-size/image-size
- https://joshua.hu/image-size-infinite-loop-dos-vulnerabilities
- https://web.archive.org/web/20260224152152/https://github.com/image-size/image-size/pull/439
- https://www.vulncheck.com/advisories/image-size-denial-of-service-via-infinite-loop-in-jxl-heif-parser
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness (CWE)
CWE-835- Platform
- npm
- Package
image-size- Disclosed
- 10.06.2026
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-5p2g-fcmc-qvqq - CC BY 4.0
Vulnerability history: image-size
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 3
- First → latest
- 04.2025 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 3
Disclosures per year
- 2025: 1
- 2026: 2
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image-size: JXL and HEIF parsers allow denial of service through infinite loops this entry
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