image-size 2.0.2 Denial of Service via Infinite Loop in JXL/HEIF Parser
CVE-2025-71329

8.7HIGH

Key Information:

Vendor

Image-size

Status
Image-size
Vendor
CVE Published:
10 June 2026

Badges

👾 Exploit Exists

What is CVE-2025-71329?

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 Version(s)

image-size 1.1.0 <= 1.2.1

image-size 2.0.0 <= 2.0.2

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

Joshua Rogers (@MegaManSec)
.