CVE-2026-107300

About vulnerability

Impact

The streaming decoder recursively invokes itself for every complete value remaining in a chunk. A single chunk containing many small valid MessagePack values can exhaust the JavaScript call stack and interrupt the process or stream.

Patches

The streaming decoder now drains concatenated values iteratively with constant call-stack depth.

Workarounds

Limit the number of MessagePack values accepted in one chunk, or split large batches before passing them to the decoder stream.

Affected product:

loopback , loopback-connector , loopback-connector-remote , loopback-datasource-juggler , msgpack5

Affected packages:

msgpack5 @ 3.6.1 (+10 more)