CVE-2026-90473

MediumCVSS 5.3/10Last modified Sep 23, 2026

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.

Metrics

CVSS 3.1 5.3/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weakness enumeration

CWE-190

Affected software

No affected versions have been published.

Timeline

Published: Sep 12, 2026
Last modified: Sep 23, 2026
NVD status: Deferred

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