CVE-2026-32284

Denial of service in github.com/shamaton/msgpack

HIGH
7.5
CVSS Score
Published: March 26, 2026 at 07:40 PM UTC
Updated: October 7, 2026 at 06:17 PM UTC
4 products affected across 4 vendorsMsgpackProject MessagepackMsgpack

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (4)

Issue TrackingVendor Advisory
Source: cverecord
https://github.com/shamaton/msgpack/issues/59
Issue TrackingThird Party Advisory
Source: cverecord
https://github.com/golang/vulndb/issues/4513
Third Party Advisory
Source: cverecord
https://pkg.go.dev/vuln/GO-2026-4513
ExploitThird Party Advisory
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
https://securityinfinity.com/research/shamaton-msgpack-oob-panic-fixext-dos-2026

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-125

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