CVE-2026-90472

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.

  • Published Sep 12, 2026
  • CVSS 6.9 medium
  • 0.6% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-90472 at the National Vulnerability Database