What is CVE-2026-107298?

CVE-2026-107298 is a medium-severity vulnerability in Mcollina Msgpack5, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-10-08.

How severe is CVE-2026-107298?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Mcollina Msgpack5

CVE-2026-107298

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.

Published 2026-10-08.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Mcollina Msgpack5 — versions < 6.1.0

Weakness classification (CWE)

CWE-674 — Uncontrolled Recursion

References

Frequently asked questions

What is CVE-2026-107298?: CVE-2026-107298 is a medium-severity vulnerability in Mcollina Msgpack5, classified under Uncontrolled Recursion. CVSS score: 5.3/10. Published 2026-10-08.
How severe is CVE-2026-107298?: Medium severity. CVSS v3 base score is 5.3 out of 10.