MEDIUM

CVE-2026-90473

2026-09-12 CVSS v3.1

CVSS

5.3

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.

Weakness (CWE)

CWE-190 Integer Overflow

EPSS Score

0.24%

Probability of exploitation in next 30 days

15.5th percentile

References

https://github.com/msgpack/msgpack-java https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581 https://github.com/msgpack/msgpack-java/issues/1014 https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32

View on dbcve.org

Base CVE data derived from NVD (public domain). Enrichment by dbcve.org (CC-BY-4.0). Fetched via API.

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