CVE-2026-42274 (GCVE-0-2026-42274)

Vulnerability from cvelistv5 – Published: 2026-05-08 03:43 – Updated: 2026-05-11 18:20
VLAI
Title
Heimdall: Authorization bypass via path normalization mismatch
Summary
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.
Severity
7.8 (High)
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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 18:19 UTC
CWE
  • CWE-35 - Path Traversal: '.../...//'
  • CWE-436 - Interpretation Conflict
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 8129 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
dadrus heimdall Affected: < 0.17.14
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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