Denial of service in github.com/shamaton/msgpack

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Summary

CVECVE-2026-32284
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-26 20:16:12 UTC
Updated2026-06-03 14:42:23 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000850000 probability, percentile 0.246930000 (date 2026-06-08)

Problem Types: CWE-125 | CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Shamaton Msgpack All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Github.comshamatonmsgpack Github.com/shamaton/msgpack Not specified Not specified
CNA Github.comshamatonmsgpackv2 Github.com/shamaton/msgpack/v2 Not specified Not specified
CNA Github.comshamatonmsgpackv3 Github.com/shamaton/msgpack/v3 Not specified Not specified

References

ReferenceSourceLinkTags
github.com/shamaton/msgpack/issues/59 [email protected] github.com Issue Tracking, Vendor Advisory
github.com/golang/vulndb/issues/4513 [email protected] github.com Issue Tracking, Third Party Advisory
securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026 134c704f-9b21-4f2e-91b3-4a467353bcc0 securityinfinity.com Exploit, Third Party Advisory
pkg.go.dev/vuln/GO-2026-4513 [email protected] pkg.go.dev Third Party Advisory
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