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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 0.9.12 及更早版本中存在一个整数溢出漏洞，位于 方法中，发生在处理具有大量元素计数的 MAP32 容器时。攻击者可以提供一个大于或等于 的 MAP32 元素计数，当该计数值被加倍时发生整数回绕（wrap），导致解析器游标（cursor）失去同步，使得攻击者控制的数据被错误地返回，替代了后续字段的正常内容。

CVSS 5.3 · Medium

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

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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