CVE-2026-44375— Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException
Possible ATT&CK Techniques 1AI
T1496 · Resource HijackingAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| AArnott | Nerdbank.MessagePack | < 1.1.62 | affected |
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I. Basic Information for CVE-2026-44375
Vulnerability Information
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Vulnerability Title
Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException
Source: NVD (National Vulnerability Database)
Vulnerability Description
Nerdbank.MessagePack is a NativeAOT-compatible MessagePack serialization library. Prior to 1.1.62, Nerdbank.MessagePack contains an uncontrolled stack allocation vulnerability in DateTime decoding. A malicious MessagePack payload can declare an oversized timestamp extension length, causing the reader to allocate an attacker-controlled number of bytes on the stack. This can trigger a StackOverflowException, which is not catchable by user code and terminates the process. This vulnerability is fixed in 1.1.62.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未经控制的内存分配
Source: NVD (National Vulnerability Database)
Vulnerability Title
Nerdbank.MessagePack 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Nerdbank.MessagePack是Andrew Arnott个人开发者的一个面向.NET平台的MessagePack序列化库。 Nerdbank.MessagePack 1.1.62之前版本存在安全漏洞，该漏洞源于DateTime解码中存在不受控制的栈分配，恶意MessagePack有效载荷可声明过大的时间戳扩展长度，导致读取器在栈上分配攻击者控制的字节数，触发StackOverflowException并终止进程。
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 |
|---|---|---|---|---|
| AArnott | Nerdbank.MessagePack | < 1.1.62 | - |
II. Public POCs for CVE-2026-44375
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POCPremium
Qwen3.6-35B-A3B · 9558 chars
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III. Intelligence Information for CVE-2026-44375
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- https://github.com/AArnott/Nerdbank.MessagePack/pull/941x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-44375
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Same weakness: CWE-789
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V. Comments for CVE-2026-44375
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