CVE-2026-107296

LowCVSS 3.7/10Last modified Oct 14, 2026

Description

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.

Metrics

CVSS 3.1 3.7/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-471

Affected software

Vendor	Product	Versions
mcollina	msgpack5	< 6.1.0

References

Timeline

Published: Oct 8, 2026
Last modified: Oct 14, 2026
NVD status: Deferred

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