Input Validation Vulnerability in Msgpack Decoder Impacting Go
CVE-2026-32284

7.5HIGH

Key Information:

Vendor

Github.com/shamaton/msgpack

Status
Github.com/shamaton/msgpack
Github.com/shamaton/msgpack/v2
Github.com/shamaton/msgpack/v3
Vendor
CVE Published:
26 March 2026

What is CVE-2026-32284?

The vulnerability in the Msgpack decoder arises from insufficient validation of the input buffer length, specifically during the processing of truncated fixext data. This flaw may lead to an out-of-bounds read scenario, resulting in a runtime panic and potential denial of service. Attackers can exploit this vulnerability by sending specially crafted inputs, compromising the stability and availability of applications relying on this decoder.

References

https://github.com/shamaton/msgpack/issues/59
https://github.com/golang/vulndb/issues/4513
https://pkg.go.dev/vuln/GO-2026-4513

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.