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[ CVE-2026-107298 · Published 8 Oct 2026 ]

msgpack5: Deeply nested input can exhaust the decoder stack

CVSS 5.3 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 array and map decoding paths have no nesting-depth limit, allowing an attacker who can provide MessagePack input to submit deeply nested containers that exhaust the JavaScript call stack and interrupt a process, worker, or request handler. 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