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CVE-2026-76654— Subpath symlinking on Windows nodes permits NTLM coercion

Quick assessment

Affected
Kubernetes Kubernetes
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.

在 Windows 节点上存在 NTLM 强制认证漏洞：当 Pod 的 volumeMounts 中指定的 subPath 被设置为指向攻击者控制的网络共享的符号链接时，kubelet 在解析符号链接时不会拒绝解析结果为 UNC 路径的目标。因此，kubelet 会透明地尝试使用 NTLM 协议对该共享进行身份验证。这使得攻击者能够获取 kubelet 运行账户的 NetNTLMv2 哈希值。随后，攻击者可以尝试破解该哈希以还原对应密码，或者在节点已加入域的情况下，通过哈希重放（relay）来冒充该节点。

CVSS 5.8 · Medium
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I. Basic Information for CVE-2026-76654

Vulnerability Information
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Vulnerability Title
Subpath symlinking on Windows nodes permits NTLM coercion
Source: CVE Program / CVE List V5
Vulnerability Description
An NTLM coercion vulnerability exists on Windows nodes when the subPath supplied in a pod's volumeMounts is set to a symbolic link that points to an attacker-controlled network share. When a kubelet resolves symlinks, it does not reject a target that resolves to a UNC path. As a result, the kubelet will transparently attempt to authenticate to the share using NTLM. This allows an attacker to obtain the NetNTLMv2 hash of the account under which the kubelet is running. An attacker could then attempt to crack the hash to retrieve the corresponding password or relay it to impersonate the node, if the node is domain-joined.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Kubernetes Kubernetes v1.34.0 ~ v1.34.11 -

II. Public POCs for CVE-2026-76654

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III. Intelligence Information for CVE-2026-76654

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Other References for CVE-2026-76654 (2)

IV. Related Vulnerabilities

Same product: Kubernetes
Same vendor: Kubernetes
Same weakness: CWE-59