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CVE-2026-42274— Heimdall: Authorization bypass via path normalization mismatch

EPSS 0.05% · P14
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I. Basic Information for CVE-2026-42274

Vulnerability Information
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Vulnerability Title
Heimdall: Authorization bypass via path normalization mismatch
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 rule matching on the raw (non-normalized) request path, while downstream components may normalize dot-segments according to RFC 3986, Section 6.2.2.3. This discrepancy can result in heimdall authorizing a request for one path (e.g., /user/../admin, or URL-encoded variants such as /user/%2e%2e/admin or /user/%2e%2e%2fadmin. The latter would require the allow_encoded_slashes option to be set to on or no_decode.) while the downstream ultimately processes a different, normalized path (/admin). 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
路径遍历：’…/…//’
Source: NVD (National Vulnerability Database)
Vulnerability Title
Heimdall 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Heimdall是LinuxServer.io开源的一个应用程序面板和启动器。 Heimdall 0.17.14之前版本存在安全漏洞，该漏洞源于规则匹配使用原始请求路径，而下游组件可能根据RFC 3986第6.2.2.3节规范化点段，导致授权绕过。
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-2026-42274

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III. Intelligence Information for CVE-2026-42274

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

CVE-2026-42273Heimdall: Case-sensitive host matching may lead to policy bypass
CVE-2026-42272Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path int

IV. Related Vulnerabilities

Same product: heimdall
Same vendor: dadrus
Same weakness: CWE-35

V. Comments for CVE-2026-42274

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