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

Status: published. Published: 2026-06-10. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://web.archive.org/web/20260224152152/https://github.com/image-size/image-size/pull/439

## Affected products and versions

- image-size / image-size (image-size): ≥ 1.1.0; ≤ 1.2.1 (affected, semver); ≥ 2.0.0; ≤ 2.0.2 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 8.7 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.43% as of 2026-11-08; percentile 37.51%

- SSVC: exploitation poc; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-835

## Exploit evidence

- exploit: https://joshua.hu/image-size-infinite-loop-dos-vulnerabilities (CNA: VulnCheck)

## References

- https://joshua.hu/image-size-infinite-loop-dos-vulnerabilities (CNA: VulnCheck; technical-description, exploit)

- https://web.archive.org/web/20260224152152/https://github.com/image-size/image-size/pull/439 (CNA: VulnCheck; issue-tracking, patch)

- https://www.vulncheck.com/advisories/image-size-denial-of-service-via-malformed-icns-image-parsing (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2025-71330; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2025-71330; retrieved 2026-11-08; source updated Not reported

Revision: 2764399854f103eb4d0e6853420926168a77b04091ed596825c4466fc15b5c0b

Canonical: https://y2.dev/cve/CVE-2025-71330

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