CVE-2025-71330: image-size — Exploit & Fix

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 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.

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CVSS v3.1 Score

7.5

HIGH

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

EPSS — Exploit Prediction

0.0043

Probability of exploitation

0.35%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-835 CWE-835

Affected Products

Vendor	Product	Versions
image-size	image-size	1.1.0 — 1.2.1
image-size	image-size	2.0.0 — 2.0.2

References

Advisories & Patches

https://web.archive.org/web/20260224152152/https://github.com/image-size/image-size/pull/439

Exploits

https://joshua.hu/image-size-infinite-loop-dos-vulnerabilities

Other References

https://www.vulncheck.com/advisories/image-size-denial-of-service-via-malformed-icns-image-parsing

Frequently Asked Questions

What is CVE-2025-71330? +

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. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2025-71330? +

CVE-2025-71330 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0043, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2025-71330? +

CVE-2025-71330 affects products from image-size, specifically: image-size. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-71330? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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