CVE-2026-107296
Low
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.
SeverityLow
CVSS3.7
Exploit probability—
ProductMsgpack5
PublishedOct 8, 2026
First seenOct 8, 2026
Weakness typeCWE-471CWE-471
How to fix
Update
- msgpack56.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| msgpack5npm | v < 6.1.0 | 6.1.0 |
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