mcollina/msgpack5 · Security
msgpack5: Many buffered values can exhaust the streaming decoder stack
- GHSA ID
- GHSA-5x5g-h9x8-2fh9
- CVE ID
- CVE-2026-107300
- Severity
- high
- Published
- Updated
- CVSS
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CVSS v3
- 7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
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.
CWEs
- CWE-674 · Uncontrolled Recursion