MEDIUM 6.9 NVD
CVE-2026-90473
msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts
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.
References
- https://github.com/msgpack/msgpack-java
- https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpac
- https://github.com/msgpack/msgpack-java/issues/1014
- https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map3
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-09-12 via NVD.
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