msgpack msgpack-java up to 0.9.12 MessageUnpacker MessageUnpacker.skipValue integer overflow

Summaryinfo

A vulnerability was found in msgpack msgpack-java up to 0.9.12. It has been declared as problematic. Impacted is the function MessageUnpacker.skipValue of the component MessageUnpacker. The manipulation results in integer overflow. This vulnerability is reported as CVE-2026-90473. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, was found in msgpack msgpack-java up to 0.9.12. Affected is the function MessageUnpacker.skipValue of the component MessageUnpacker. The manipulation with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-90473 since 09/12/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/12/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

• Programming Language Software

Vendor

• msgpack

Name

• msgpack-java

Version

• 0.9.0
• 0.9.1
• 0.9.2
• 0.9.3
• 0.9.4
• 0.9.5
• 0.9.6
• 0.9.7
• 0.9.8
• 0.9.9
• 0.9.10
• 0.9.11
• 0.9.12

Website

• Product: https://github.com/msgpack/msgpack-java/

CPE 2.3info

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CPE 2.2info

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Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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