CVE-2026-90473mediumCWE-190

CVE-2026-90473: medium-severity vulnerability in msgpack-java

msgpack-java through 0.9.12 Integer Overflow via MAP32

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13Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 6.9epss 0.4%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Affected products
msgpack · msgpack-java
Related CVEs — msgpack-java

In the same product, most dangerous first.

CVE-2026-21452HIGHMessagePack-Java Vulnerable to Remote Denial of Service via Malicious .msgpack Model File Triggering Unbounded EXT Payload AllocationEPSS 0.6%CVE-2026-90472MEDIUMmsgpack-java through 0.9.12 Stack Overflow via Nested ArraysEPSS 0.6%