CVE-2026-42274
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.
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
8- github.com/advisories/GHSA-3q34-rx83-r6mqghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-42274ghsaADVISORY
- github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947anvdWEB
- github.com/dadrus/heimdall/pull/3209nvdWEB
- github.com/dadrus/heimdall/releases/tag/v0.17.14nvdWEB
- github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mqnvdWEB
- www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/network/http_connection_manager/v3/http_connection_manager.protoghsaWEB
- www.rfc-editor.org/rfc/rfc3986ghsaWEB
News mentions
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