CVE-2026-107300
Published:October 08, 2026
Updated:October 09, 2026
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.
Affected Packages
msgpack5 (CDN_JS):
Affected version(s) >=6.0.0 <6.1.0Fix Suggestion:
Update to version 6.1.0https://github.com/mcollina/msgpack5.git (GITHUB):
Affected version(s) >=v6.0.0 <v6.1.0Fix Suggestion:
Update to version v6.1.0msgpack5 (NPM):
Affected version(s) >=6.0.0 <6.1.0Fix Suggestion:
Update to version 6.1.0Related Resources (6)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Uncontrolled Recursion