GitHub Advisoryadvisory · Go
GHSA-h9q6-hc68-35rp Denial of service in github.com/shamaton/msgpack
HIGH
Official page ↗
- Aliases
- CVE-2026-32284
- Ecosystem
- Go
- Packages
- github.com/shamaton/msgpack/v2, github.com/shamaton/msgpack/v3
- Severity
- High
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-125
- Reviewed
- 2026-03-18
Affected packages
• Go github.com/shamaton/msgpack/v2: <= 2.4.0 (no fix yet)
• Go github.com/shamaton/msgpack/v3: <= 3.1.0 (no fix yet)
Description
The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). This can lead to an out-of-bounds read and a runtime panic, allowing a denial of service attack.
Related
Alias · CVE (1)
- CVE-2026-32284 The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format codes 0xd4-0xd8). vulnerability
Weakness · CWE (1)
- CWE-125 Out-of-bounds Read weakness
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-32284 advisory
- https://github.com/golang/vulndb/issues/4513 web
- https://github.com/shamaton/msgpack/issues/59 web
- https://github.com/shamaton/msgpack package
- https://pkg.go.dev/vuln/GO-2026-4513 web
- https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026 web