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PatchSiren cyber security CVE debrief

CVE-2025-71319 image-size CVE debrief

CVE-2025-71319 is a high-severity denial of service vulnerability in image-size through 2.0.2. Remote attackers can exploit this vulnerability by supplying a specially crafted image buffer with a zero-valued size field in a recognized box-type, causing an infinite loop in the JXL or HEIF image parsers and permanently blocking the Node.js event loop.

Vendor
image-size
Product
Unknown
CVSS
HIGH 8.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-21
Advisory published
2026-06-09
Advisory updated
2026-07-21

Who should care

Developers and administrators using image-size through 2.0.2 in their applications should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability is caused by a specially crafted image buffer with a zero-valued size field in a recognized box-type, which can trigger an infinite loop in the JXL or HEIF image parsers. This can cause the Node.js event loop to become permanently blocked, leading to a denial of service.

Defensive priority

high

Recommended defensive actions

  • Update to a version of image-size that is not vulnerable (e.g., version 2.0.3 or later).
  • Implement input validation and sanitization to prevent specially crafted image buffers from being processed.
  • Use a Web Application Firewall (WAF) to detect and block suspicious traffic.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively. Additional information can be found at [ref-4], [ref-5], and [ref-6].

Sources and references

Verified primary and authoritative sources

  • CVE-2025-71319 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-71319

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2025-71319 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-71319

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.