CVE-2026-35199— Microsoft Windows SymCrypt 安全漏洞
一分钟漏洞结论
影响对象
microsoft SymCrypt
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
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。
Microsoft Windows SymCrypt是美国微软（Microsoft）公司的SymCrypt 是 Windows 当前使用的核心加密函数库。 Microsoft Windows SymCrypt 103.5.0至103.11.0之前版本存在安全漏洞，该漏洞源于SymCryptXmssSign函数存在参数截断问题，可能导致堆缓冲区溢出。
可能的 ATT&CK 技术 1 AI
T1190 · Exploit Public-Facing Application
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一、 漏洞 CVE-2026-35199 基础信息
漏洞信息
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Vulnerability Title
SymCrypt SymCryptXmssSign function - Heap overflow via 64->32-bit leaf-count truncation
来源: CVE Program / CVE List V5
Vulnerability Description
SymCrypt is the core cryptographic function library currently used by Windows. From 103.5.0 to before 103.11.0, The SymCryptXmssSign function passes a 64-bit leaf count value to a helper function that accepts a 32-bit parameter. For XMSS^MT parameter sets with total tree height >= 32 (which includes standard predefined parameters), this causes silent truncation to zero, resulting in a drastically undersized scratch buffer allocation followed by a heap buffer overflow during signature computation. Exploiting this issue would require an application using SymCrypt to perform an XMSS^MT signature using an attacker-controlled parameter set. It is uncommon for applications to allow the use of attacker-controlled parameter sets for signing, since signing is a private key operation, and private keys must be trusted by definition. Additionally, XMSS(^MT) signing should only be performed in a Hardware Security Module (HSM). XMSS(^MT) signing is provided in SymCrypt only for testing purposes. This is a general rule irrespective of this CVE; XMSS(^MT) and other stateful signature schemes are only cryptographically secure when it is guaranteed that the same state cannot be reused for two different signatures, which cannot be guaranteed by software alone. For this reason, XMSS(^MT) signing is also not FIPS approved when performed outside of an HSM. Fixed in version 103.11.0.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
来源: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows SymCrypt 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Microsoft Windows SymCrypt是美国微软（Microsoft）公司的SymCrypt 是 Windows 当前使用的核心加密函数库。 Microsoft Windows SymCrypt 103.5.0至103.11.0之前版本存在安全漏洞，该漏洞源于SymCryptXmssSign函数存在参数截断问题，可能导致堆缓冲区溢出。
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
二、漏洞 CVE-2026-35199 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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IV. Related Vulnerabilities
V. Comments for CVE-2026-35199
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