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.
Related Weaknesses (CWE)
References
- https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f43
- https://github.com/dadrus/heimdall/pull/3207
- https://github.com/dadrus/heimdall/releases/tag/v0.17.14
- https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67
FAQ
What is CVE-2026-42272?
CVE-2026-42272 is a documented vulnerability. 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-enco...
How severe is CVE-2026-42272?
CVSS scoring is not yet available for CVE-2026-42272. Check NVD for updates.
Is there a patch for CVE-2026-42272?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.