CVE-2026-107298: Mcollina MSGPACK5

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mcollina MSGPACK5: before 6.1.0 (fixed in 6.1.0)

Published 2026-10-08. Last modified 2026-10-09.