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CVE-2026-42272— Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation

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，该漏洞源于以区分大小写方式处理URL编码的斜杠，而百分号编码定义为不区分大小写，当allow_encoded_slashes设置为off时小写等效形式不被识别，可能导致请求路径在heimdall和上游组件之间解释差异，导致授权绕过。

AI Predicted 9.8 Difficulty: Easy EPSS 0.55% · P44

Possible ATT&CK Techniques 1 AI

T1078.004 · Cloud Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
dadrus heimdall < 0.17.14 affected
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I. Basic Information for CVE-2026-42272

Vulnerability Information
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Vulnerability Title
Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation
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 handles URL-encoded slashes (%2F) in a case-sensitive manner, while percent-encoding is defined to be case-insensitive. As a result, the lowercase equivalent (%2f) is not recognized and therefore not processed as expected when allow_encoded_slashes is set to off (the default setting). This discrepancy can lead to differences in how request paths are interpreted by heimdall and upstream components, which may result in authorization bypass. 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
解释冲突
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，该漏洞源于以区分大小写方式处理URL编码的斜杠，而百分号编码定义为不区分大小写，当allow_encoded_slashes设置为off时小写等效形式不被识别，可能导致请求路径在heimdall和上游组件之间解释差异，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-2026-42272

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III. Intelligence Information for CVE-2026-42272

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Patches & Fixes for CVE-2026-42272 (1)

Vendor Advisories for CVE-2026-42272 (1)

Vendor Pages for CVE-2026-42272 (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-2026-42274 Heimdall: Authorization bypass via path normalization mismatch

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-42272

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