Home/CVE/The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format cod
CVE

CVE-2026-32284

The msgpack decoder fails to properly validate the input buffer length when processing truncated fixext data (format cod

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.

HIGH · CVSS 7.5 EPSS 0.00062
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
▤

Affected Packages

3
Language-ecosystem packages (from OSV) tied to this CVE, with the version that fixes it - the dependency-level detail NVD doesn’t carry.
Go github.com/shamaton/msgpack
Go github.com/shamaton/msgpack/v2 HIGH
Go github.com/shamaton/msgpack/v3 HIGH
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@golang.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Mar 2026 · 08:16 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/golang/vulndb/issues/4513
https://github.com/shamaton/msgpack/issues/59
https://pkg.go.dev/vuln/GO-2026-4513
https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026
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