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CVE-2026-34397— himmelblau: NSS fake-primary group lookup reintroduces name collision risk

Quick assessment

Affected
himmelblau-idm himmelblau
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.

Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau存在安全漏洞，该漏洞源于在边缘情况命名冲突中存在条件性本地权限提升，映射的CN或短名称与特权本地组名完全匹配的已认证himmelblau用户可能导致NSS模块将该组名解析为其伪造的主组，若系统使用NSS结果进行基于组的授权决策，可能授予攻击者该组的权限。以下版本受到影响：2.0.0-alpha至2.3.9之前版本和3.0.0-alpha至3.1.1之前版本。

CVSS 6.3 · Medium EPSS 0.15% · P4
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I. Basic Information for CVE-2026-34397

Vulnerability Information
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Vulnerability Title
himmelblau: NSS fake-primary group lookup reintroduces name collision risk
Source: CVE Program / CVE List V5
Vulnerability Description
Himmelblau is an interoperability suite for Microsoft Azure Entra ID and Intune. From versions 2.0.0-alpha to before 2.3.9 and 3.0.0-alpha to before 3.1.1, there is a conditional local privilege escalation vulnerability in an edge-case naming collision. Only authenticated himmelblau users whose mapped CN/short name exactly matches a privileged local group name (e.g., "sudo", "wheel", "docker", "adm") can cause the NSS module to resolve that group name to their fake primary group. If the system uses NSS results for group-based authorization decisions (sudo, polkit, etc.), this can grant the attacker the privileges of that group. This issue has been patched in versions 2.3.9 and 3.1.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Himmelblau 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Himmelblau是Himmelblau开源的一个 Azure Entra ID 身份验证模块。 Himmelblau存在安全漏洞，该漏洞源于在边缘情况命名冲突中存在条件性本地权限提升，映射的CN或短名称与特权本地组名完全匹配的已认证himmelblau用户可能导致NSS模块将该组名解析为其伪造的主组，若系统使用NSS结果进行基于组的授权决策，可能授予攻击者该组的权限。以下版本受到影响：2.0.0-alpha至2.3.9之前版本和3.0.0-alpha至3.1.1之前版本。
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
himmelblau-idm himmelblau >= 2.0.0-alpha, < 2.3.9 -

II. Public POCs for CVE-2026-34397

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III. Intelligence Information for CVE-2026-34397

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Vendor Advisories for CVE-2026-34397 (1)

Vendor Pages for CVE-2026-34397 (2)

IV. Related Vulnerabilities

Same product: himmelblau
Same vendor: himmelblau-idm
Same weakness: CWE-269

V. Comments for CVE-2026-34397

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