CVE-2025-71329 image-size 2.0.2 Denial of Service via Infinite Loop in JXL/HEIF Parser
Remote attackers can cause a permanent application hang in image-size by supplying crafted JXL or HEIF images with zero-sized boxes, blocking the Node.js event loop.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-71329?
CVE-2025-71329 is a high-severity denial of service vulnerability in image-size, published on 10 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-835
Which versions are affected by CVE-2025-71329?
2 open source packages ship an affected version, including image-size. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
image-size npm | From 1.2.0 | 2.0.3 |
image-size npm | From 1.2.0 | 2.0.3 |
Products include Image-Size Image-Size.
How do I fix CVE-2025-71329?
Upgrade image-size to 2.0.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-71329 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-71329 exists.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in image-size
Sources
Also known as GHSA-5p2g-fcmc-qvqq, MINI-8pqf-2pj3-275w, MINI-fqhj-qvmc-8f88, MINI-vpcc-p3h3-xv54, ROOT-APP-NPM-CVE-2025-71329.