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.

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.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
msgpack msgpack-java unaffected
Version Status Constraints
0 affected ≤ 0.9.12

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Project Subscriptions

Vendors Products
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Messagepack Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

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
https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-stack-overflow-via-nested-arrays cve-icon cve-icon
History

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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

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

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

Link: CVE-2026-90472

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

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

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

Link: CVE-2026-90472

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-12T18:15:19Z

Weaknesses