CVE-2026-21452— MessagePack for Java 安全漏洞
一分钟漏洞结论
影响对象
msgpack msgpack-java
利用判断
存在公开或 AI PoC，应优先验证
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
MessagePack for Java是MessagePack开源的一个序列化器软件。 MessagePack for Java 0.9.11之前版本存在安全漏洞，该漏洞源于反序列化时未限制有效载荷长度，可能导致拒绝服务。
可能的 ATT&CK 技术 1 AI
T1496 · Resource Hijacking
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一、 漏洞 CVE-2026-21452 基础信息
漏洞信息
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Vulnerability Title
MessagePack-Java Vulnerable to Remote Denial of Service via Malicious .msgpack Model File Triggering Unbounded EXT Payload Allocation
来源: CVE Program / CVE List V5
Vulnerability Description
MessagePack for Java is a serializer implementation for Java. A denial-of-service vulnerability exists in versions prior to 0.9.11 when deserializing .msgpack files containing EXT32 objects with attacker-controlled payload lengths. While MessagePack-Java parses extension headers lazily, it later trusts the declared EXT payload length when materializing the extension data. When ExtensionValue.getData() is invoked, the library attempts to allocate a byte array of the declared length without enforcing any upper bound. A malicious .msgpack file of only a few bytes can therefore trigger unbounded heap allocation, resulting in JVM heap exhaustion, process termination, or service unavailability. This vulnerability is triggered during model loading / deserialization, making it a model format vulnerability suitable for remote exploitation. The vulnerability enables a remote denial-of-service attack against applications that deserialize untrusted .msgpack model files using MessagePack for Java. A specially crafted but syntactically valid .msgpack file containing an EXT32 object with an attacker-controlled, excessively large payload length can trigger unbounded memory allocation during deserialization. When the model file is loaded, the library trusts the declared length metadata and attempts to allocate a byte array of that size, leading to rapid heap exhaustion, excessive garbage collection, or immediate JVM termination with an OutOfMemoryError. The attack requires no malformed bytes, user interaction, or elevated privileges and can be exploited remotely in real-world environments such as model registries, inference services, CI/CD pipelines, and cloud-based model hosting platforms that accept or fetch .msgpack artifacts. Because the malicious file is extremely small yet valid, it can bypass basic validation and scanning mechanisms, resulting in complete service unavailability and potential cascading failures in production systems. Version 0.9.11 fixes the vulnerability.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5
Vulnerability Title
MessagePack for Java 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
MessagePack for Java是MessagePack开源的一个序列化器软件。 MessagePack for Java 0.9.11之前版本存在安全漏洞，该漏洞源于反序列化时未限制有效载荷长度，可能导致拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| msgpack | msgpack-java | < 0.9.11 | - |
|
二、漏洞 CVE-2026-21452 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
Qwen3.6-35B-A3B
· 8782 chars
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三、漏洞 CVE-2026-21452 的情报信息
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CVE-2026-21452 补丁与修复 (1)
CVE-2026-21452 厂商安全公告 (1)
-
https://github.com/msgpack/msgpack-java/security/advisories/GHSA-cw39-r4h6-8j3x x_refsource_CONFIRM
CVE-2026-21452 其他参考 (1)
-
https://github.com/msgpack/msgpack-java/releases/tag/v0.9.11 x_refsource_MISC
IV. Related Vulnerabilities
V. Comments for CVE-2026-21452
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