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[ CVE-2026-107300 · Published 8 Oct 2026 ]

msgpack5: Many buffered values can exhaust the streaming decoder stack

CVSS 7.5 EPSS <1%Fix available

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • msgpack5 6.1.0Fixed version · GitHub Advisories · npm package msgpack5: upgrade to 6.1.0 or later (affected < 6.1.0)

[ Packages ]Affected open-source packages

[ References ]References