CVE-2026-107296
msgpack5: Decoding negative int64 values mutates the input buffer
- State
- Published
- Severity
- 3.7 Low
- Published
- Oct 8, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 7, 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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 3.7 Low | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N | GitHub_M |
Weaknesses
- CWE-471 Modification of Assumed-Immutable Data (MAID)
Affected Products
| Product | Versions |
|---|---|
msgpack5mcollina |
|
References
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