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CVE-2026-90473— msgpack-java through 0.9.12 Integer Overflow via MAP32

Quick assessment

Affected
msgpack msgpack-java
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

msgpack-java是msgpack团队的一款面向Java的高效二进制序列化组件。 msgpack-java 0.9.12及之前版本存在数字错误漏洞，该漏洞源于MessageUnpacker.skipValue()处理具有大量元素计数的MAP32容器时发生整数溢出，攻击者可提供大于等于0x40000000的MAP32元素计数，在翻倍时发生回绕，导致解析器游标不同步，攻击者控制的数据被返回以替代后续字段。

CVSS 5.3 · Medium EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
msgpack msgpack-java ≤ 0.9.12 affected
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I. Basic Information for CVE-2026-90473

Vulnerability Information
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Vulnerability Title
msgpack-java through 0.9.12 Integer Overflow via MAP32
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
msgpack-java 数字错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
msgpack-java是msgpack团队的一款面向Java的高效二进制序列化组件。 msgpack-java 0.9.12及之前版本存在数字错误漏洞，该漏洞源于MessageUnpacker.skipValue()处理具有大量元素计数的MAP32容器时发生整数溢出，攻击者可提供大于等于0x40000000的MAP32元素计数，在翻倍时发生回绕，导致解析器游标不同步，攻击者控制的数据被返回以替代后续字段。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
msgpack msgpack-java 0 ~ 0.9.12 -

II. Public POCs for CVE-2026-90473

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III. Intelligence Information for CVE-2026-90473

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Vendor Advisories for CVE-2026-90473 (2)

IV. Related Vulnerabilities

Same product: msgpack-java
Same vendor: msgpack
Same weakness: CWE-190

V. Comments for CVE-2026-90473

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