CVE-2026-107297
MEDIUM
NVD
CVSS Score
5.9
Severity
MEDIUM
Published
Oct 08, 2026
Vendor
unknown
Description
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, the streaming decoder reparses an incomplete array or map from the beginning whenever another chunk arrives. A remote peer can split one valid MessagePack container across many small chunks, causing completed elements to be decoded repeatedly, producing quadratic CPU use and blocking the event loop. This issue is fixed in version 6.1.0.