music-metadata: EBML parser trusts element lengths, allowing memory exhaustion or process abort

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

6.2 · CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

• CVE-2026-107389: 0.21% estimated exploitation activity in the next 30 days; percentile 11.82 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The Matroska/WebM EBML parser decodes attacker-controlled variable-length integer (VINT) element lengths without first validating that the declared element fits within its enclosing container or the available input. Leaf lengths are then used directly for string-token and Uint8Array allocations. A very small crafted .webm, .mkv, or .mka file can therefore cause a disproportionately large allocation, an out-of-memory denial of service, or—in one demonstrated parseFile case—an uncatchable V8 fatal abort. Impact Applications that parse untrusted Matroska/WebM media can be denied service. Depending on the input, parser API, and Node.js/V8 version, the demonstrated outcomes include: - a 34-byte input causing an approximately 128 MiB allocation before end-of-input; - a 70-byte input causing a 500 MiB allocation through a binary EBML leaf, with concurrent parses multiplying memory consumption; - a 48-byte file causing an uncatchable V8 fatal abort through parseFile when a leaf…

Published by the source

8 Oct 2026, 19:43 UTC

Last modified by the source

8 Oct 2026, 20:00 UTC

Source last checked

26 Oct 2026, 13:07 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-5gfj-9q3v-qfp3

2. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GHSA-5gfj-9q3v-qfp3

3. Revision 1 · created · 23 Oct 2026

   Published from ghsa record GHSA-5gfj-9q3v-qfp3

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# Patch Next advisory brief: CVE-2026-107389

Advisory: music-metadata: EBML parser trusts element lengths, allowing memory exhaustion or process abort
IDs: CVE-2026-107389, GHSA-5gfj-9q3v-qfp3
Record: https://patchnext.com/advisories/cve-2026-107389 (revision 3, source checked 26 Oct 2026, 13:07 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: music-metadata 11.16.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm music-metadata: affected < 11.16.0; fixed in 11.16.0

## Suggested inspection (read-only)
- `npm ls music-metadata --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on music-metadata.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-5gfj-9q3v-qfp3 (GitHub-reviewed advisory GHSA-5gfj-9q3v-qfp3 lists affected ranges: npm music-metadata >=0 <11.16.0)
- Verified: https://osv.dev/vulnerability/GHSA-5gfj-9q3v-qfp3 (OSV record GHSA-5gfj-9q3v-qfp3 lists affected ranges: npm music-metadata >=0 <11.16.0 (fixed))

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