msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Msgpack
  • Messagepack

No data.

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References
Link Providers
https://github.com/msgpack/msgpack-java cve-icon cve-icon
https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L646-L664 cve-icon cve-icon
https://github.com/msgpack/msgpack-java/issues/1015 cve-icon cve-icon cve-icon
https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-stack-overflow-via-nested-arrays cve-icon cve-icon
History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Sat, 12 Sep 2026 11:15:00 +0000

Type Values Removed Values Added
Description msgpack-java through 0.9.12 contains a stack overflow vulnerability in MessageUnpacker.unpackValue() that recursively deserializes arrays and maps without nesting depth limits. Attackers can craft payloads with deeply nested arrays to exhaust the deserializing thread's stack and trigger StackOverflowError, causing per-request deserialization failures.
Title msgpack-java through 0.9.12 Stack Overflow via Nested Arrays
First Time appeared Msgpack
Msgpack messagepack
Weaknesses CWE-674
CPEs cpe:2.3:a:msgpack:messagepack:*:*:*:*:*:java:*:*
Vendors & Products Msgpack
Msgpack messagepack
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-09-12T11:06:11.553Z

Updated: 2026-09-24T14:21:43.291Z

Reserved: 2026-09-12T02:03:23.163Z

Link: CVE-2026-90472

cve-icon Vulnrichment

Updated: 2026-09-14T16:08:03.626Z

cve-icon NVD

Status : Deferred

Published: 2026-09-12T11:16:34.180

Modified: 2026-09-23T17:17:47.347

Link: CVE-2026-90472

cve-icon Redhat

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