CVE-2026-107296 — msgpack5: Decoding negative int64 values mutates the input buffer
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-pro…
Published: 2026-10-08 · CVSS: 3.7 · CVSS 3.1
msgpack5 is a msgpack v5 implementation for node.js and the browser. Prior to 6.1.0, decoding a negative signed 64-bit integer modifies the corresponding bytes in the caller-provided input buffer while computing the value. Applications that retain or reuse encoded input for integrity checks, logging, or later processing can observe silently corrupted data, while positive integers and other MessagePack value types are unaffected. This issue is fixed in version 6.1.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7