Disclosure summary
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder recursively invokes itself for each complete MessagePack value remaining in a chunk. A remote peer can send one chunk containing many small valid values, causing recursion proportional to the value count, exhausting the JavaScript call stack, and interrupting the process or stream. This issue is fixed in version 6.1.0.
Source-reported weakness categories
CWE-674
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-107300
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
GitHub Reviewed Security Advisories · GHSA-5x5g-h9x8-2fh9
Open original source · Updated Oct 08, 2026
msgpack5: Many buffered values can exhaust the streaming decoder stack
Source severity: HIGH / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | msgpack5 | < 6.1.0 | 6.1.0 |
Original records & references
PUBLISHED 2026-10-08T13:17:16-04:00
MODIFIED 2026-10-08T16:48:36-04:00
INGESTED 2026-10-10T20:55:03-04:00