msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.
Advisories

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Fixes

Solution

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Workaround

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History

Mon, 21 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', '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 an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.
Title msgpack-java through 0.9.12 Integer Overflow via MAP32
First Time appeared Msgpack
Msgpack messagepack
Weaknesses CWE-190
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:L/A:N'}

cvssV4_0

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


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-24T14:21:44.215Z

Reserved: 2026-09-12T02:03:27.571Z

Link: CVE-2026-90473

cve-icon Vulnrichment

Updated: 2026-09-21T16:04:24.548Z

cve-icon NVD

Status : Deferred

Published: 2026-09-12T11:16:34.347

Modified: 2026-09-23T17:17:47.370

Link: CVE-2026-90473

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-15T18:30:14Z

Weaknesses