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CVE-2026-107300 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

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.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CNA: [email protected]CVSS-B:7.5 HIGHVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/mcollina/msgpack5/commit/77fbef144d05def5d16fc22c37caa64c0a7efeba	[email protected]	Source CodeVendor
https://github.com/mcollina/msgpack5/releases/tag/v6.1.0	[email protected]	Release NotesVendor
https://github.com/mcollina/msgpack5/security/advisories/GHSA-5x5g-h9x8-2fh9	[email protected]	AdvisoryRemedyVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-674	Uncontrolled Recursion	[email protected]

Affected Products

Product	Versions
mcollina msgpack5	< 6.1.0 (semver)
CPE No CPEs found in CPE dictionary for this product. Remediation Upgrade: 6.1.0moderate effort Workaround:low effort Limit the number of MessagePack values accepted in one chunk, or split large batches before passing them to the decoder stream.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 8, 2026	CVE Modified	CISA-ADP
Oct 8, 2026	New CVE Received	[email protected]