CVE-2026-90472

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductMsgpack-java

PublishedSep 12, 2026

First seenSep 12, 2026

Weakness typeCWE-674CWE-674

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

Product	Affected versions	Fixed in
msgpack msgpack-java	v ≤ 0.9.12	—

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