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CVE-2026-42273— Heimdall: Case-sensitive host matching may lead to policy bypass

EPSS 0.04% · P13
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I. Basic Information for CVE-2026-42273

Vulnerability Information
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Vulnerability Title
Heimdall: Case-sensitive host matching may lead to policy bypass
Source: NVD (National Vulnerability Database)
Vulnerability Description
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
解释冲突
Source: NVD (National Vulnerability Database)
Vulnerability Title
Heimdall 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Heimdall是dadrus开源的一个开源的身份感知代理和访问控制决策服务，用于云原生应用程序。 Heimdall 0.17.14之前版本存在安全漏洞，该漏洞源于以区分大小写方式执行主机匹配，而HTTP主机名不区分大小写，可能导致heimdall无法匹配仅字母大小写不同的请求主机规则，导致请求分类与预期不同。
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

VendorProductAffected VersionsCPESubscribe
dadrusheimdall < 0.17.14 -

II. Public POCs for CVE-2026-42273

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III. Intelligence Information for CVE-2026-42273

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Same Patch Batch · dadrus · 2026-05-08 · 3 CVEs total

CVE-2026-42272Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path int
CVE-2026-42274Heimdall: Authorization bypass via path normalization mismatch

IV. Related Vulnerabilities

Same product: heimdall
Same vendor: dadrus
Same weakness: CWE-436

V. Comments for CVE-2026-42273

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