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CVE-2026-44375— Nerdbank.MessagePack: Attacker-controlled stackalloc in DateTime decoding causes process-terminating StackOverflowException

Quick assessment

Affected
AArnott Nerdbank.MessagePack
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.5 · High EPSS 0.63% · P50

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: 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
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
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
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Qwen3.6-35B-A3B · 9489 chars
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III. Intelligence Information for CVE-2026-44375

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Patches & Fixes for CVE-2026-44375 (1)

Vendor Advisories for CVE-2026-44375 (1)

Vendor Pages for CVE-2026-44375 (1)

IV. Related Vulnerabilities

Same weakness: CWE-789

V. Comments for CVE-2026-44375

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