CVE-2026-42274: CWE-35: Path Traversal: '.../...//' in dadrus heimdall
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.
AI Analysis
Technical Summary
Heimdall, a cloud native Identity Aware Proxy and Access Control Decision service, prior to version 0.17.14, performs authorization rule matching on raw request paths without normalizing dot-segments (e.g., '/../'). Downstream components normalize these paths according to RFC 3986 Section 6.2.2.3, leading to a discrepancy where heimdall may authorize access to a path like '/user/../admin' or its URL-encoded variants, but the downstream processes the normalized path '/admin'. This path traversal vulnerability (CWE-35) can result in unauthorized access. The vulnerability is tracked as CVE-2026-42274 with a CVSS 4.0 score of 7.8 (high severity) and has been patched in heimdall version 0.17.14.
Potential Impact
Successful exploitation allows an attacker to bypass access controls by exploiting the difference between heimdall's raw path matching and downstream path normalization, potentially granting unauthorized access to protected resources. The vulnerability is rated high severity with a CVSS score of 7.8, indicating significant risk if exploited.
Mitigation Recommendations
Upgrade heimdall to version 0.17.14 or later, where this path traversal vulnerability has been patched. No other mitigation is indicated or required according to the available data.
CVE-2026-42274: CWE-35: Path Traversal: '.../...//' in dadrus heimdall
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.
CVSS v4.0
Score 7.8high
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Heimdall, a cloud native Identity Aware Proxy and Access Control Decision service, prior to version 0.17.14, performs authorization rule matching on raw request paths without normalizing dot-segments (e.g., '/../'). Downstream components normalize these paths according to RFC 3986 Section 6.2.2.3, leading to a discrepancy where heimdall may authorize access to a path like '/user/../admin' or its URL-encoded variants, but the downstream processes the normalized path '/admin'. This path traversal vulnerability (CWE-35) can result in unauthorized access. The vulnerability is tracked as CVE-2026-42274 with a CVSS 4.0 score of 7.8 (high severity) and has been patched in heimdall version 0.17.14.
Potential Impact
Successful exploitation allows an attacker to bypass access controls by exploiting the difference between heimdall's raw path matching and downstream path normalization, potentially granting unauthorized access to protected resources. The vulnerability is rated high severity with a CVSS score of 7.8, indicating significant risk if exploited.
Mitigation Recommendations
Upgrade heimdall to version 0.17.14 or later, where this path traversal vulnerability has been patched. No other mitigation is indicated or required according to the available data.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-26T11:53:27.707Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fd5dc1cbff5d86108b6498
Added to database: 05/08/2026, 03:51:29 UTC
Last enriched: 05/15/2026, 10:42:43 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 86
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