CVE-2026-90473
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
ProductMsgpack-java
PublishedSep 12, 2026
First seenSep 12, 2026
Weakness typeCWE-190Integer overflow
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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