image-size 2.0.2 Denial of Service via Malformed ICNS Image Parsing
CVE-2025-71330

8.7HIGH

Key Information:

Vendor

Image-size

Status
Image-size
Vendor
CVE Published:
10 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

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.

Affected Version(s)

image-size 1.1.0 <= 1.2.1

image-size 2.0.0 <= 2.0.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-71330 - Proof of Concept

References

https://joshua.hu/image-size-infinite-loop-dos-vulnerabil...
technical-descriptionexploit
https://web.archive.org/web/20260224152152/https://github...
patch
https://www.vulncheck.com/advisories/image-size-denial-of...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Preston Price (@prestonprice57)
.