image-size: ICNS parser allows denial of service through an infinite loopGHSA-w3rx-r6r6-pgpr
HIGHFix: image-size/image-size#439GHSA-w3rx-r6r6-pgpr is a high-severity (CVSS 7.5) CWE-835 vulnerability in image-size. A fix is available for image-size — see the affected versions and patch details below.
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
- CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
Exploitation and automatability from CISA’s SSVC triage for GHSA-w3rx-r6r6-pgpr.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.
image-sizenpmDescription
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 ICNS image buffer. Attackers can craft an ICNS buffer containing valid magic bytes and a zero-valued entry length field to trigger an infinite loop in the ICNS parser, as the offset is never incremented when the entry length field is 0, causing the while loop condition to remain true indefinitely.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 📦npm | image-size | ≥ 0.6.3&&< 2.0.3 | 2.0.3npm install image-size@2.0.3 |
Affected Products
image-sizeimage-sizeDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for image-size, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update image-size to 2.0.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-w3rx-r6r6-pgpr is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
A flaw was found in the image-size npm package. A crafted ICNS image buffer with a zero-valued entry length field can trigger an infinite loop in the ICNS parser, permanently blocking the Node.js event loop and causing a denial of service.
Upgrade to a version of image-size that validates ICNS entry length fields. As a workaround, validate image inputs before passing them to image-size, rejecting ICNS files with zero-length entries.Source: Red Hat security advisory for GHSA-w3rx-r6r6-pgpr (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift AI 3.4 | rhoai/odh-workbench-codeserver-datascience-cpu-py312-rhel9:1787121387 | RHSA-2026:60520 |
Frequently Asked Questions
Is GHSA-w3rx-r6r6-pgpr in your dependencies?
Find it across npm, including transitive dependencies.