high7.8
CVE-2026-42273
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service.
Impact
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.14, Heimdall performs host matching in a case-sensitive manner, while HTTP hostnames are case-insensitive. This discrepancy can result in heimdall failing to match a rule for a request host that differs only in letter casing, potentially causing the request to be classified differently than intended. This issue has been patched in version 0.17.14.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/dadrus/heimdall | < 0.17.14 | 0.17.14 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-72h4-mxfc-jx37
- https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37
- https://nvd.nist.gov/vuln/detail/CVE-2026-42273
- https://github.com/dadrus/heimdall/pull/3208
- https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943
- https://github.com/dadrus/heimdall/releases/tag/v0.17.14