CVE-2026-42272
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/dadrus/heimdallGo | < 0.17.14 | 0.17.14 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-43jv-5j4x-qv67ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42272ghsaADVISORY
- github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351nvdWEB
- github.com/dadrus/heimdall/pull/3207nvdWEB
- github.com/dadrus/heimdall/releases/tag/v0.17.14nvdWEB
- github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67nvdWEB
News mentions
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