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

Quick assessment

Affected
dadrus heimdall
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.

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。

AI Predicted 8.1 Difficulty: Easy EPSS 0.54% · P44

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
dadrus heimdall < 0.17.14 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
路径遍历：’…/…//’
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
dadrus heimdall < 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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Patches & Fixes for CVE-2026-42274 (1)

Vendor Advisories for CVE-2026-42274 (1)

Vendor Pages for CVE-2026-42274 (1)

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

CVE-2026-42273 Heimdall: Case-sensitive host matching may lead to policy bypass
CVE-2026-42272 Heimdall: 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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