{"cve":"CVE-2026-42273","nvd":{"published":"2026-05-08T04:16:22.457","modified":"2026-10-26T20:10:00.160","status":"Deferred","description":"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.","cvss_v4":{"vector":"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","score":7.8},"cvss_v3":null,"cwes":["CWE-178","CWE-436"],"references":["https://github.com/dadrus/heimdall/commit/3d05e56a9e7ef0355f17482b4322054af4e85943","https://github.com/dadrus/heimdall/pull/3208","https://github.com/dadrus/heimdall/releases/tag/v0.17.14","https://github.com/dadrus/heimdall/security/advisories/GHSA-72h4-mxfc-jx37"],"products":[],"source":"nvd","synced_at":"2026-10-26T20:34:58.897451322+00:00"},"epss":{"cve":"CVE-2026-42273","score":0.00301,"percentile":0.22643,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-72h4-mxfc-jx37","url":"https://osv.dev/vulnerability/GHSA-72h4-mxfc-jx37","summary":"Heimdall: Case-sensitive host matching may lead to policy bypass","modified":"2026-06-25T19:56:09.400522685Z","packages":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","ranges":["<0.17.14"],"fixed":["0.17.14"]}]},{"id":"GO-2026-5200","url":"https://osv.dev/vulnerability/GO-2026-5200","summary":"Heimdall: Case-sensitive host matching may lead to policy bypass in github.com/dadrus/heimdall","modified":"2026-06-25T19:45:13.917171146Z","packages":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","purl":"pkg:golang/github.com/dadrus/heimdall","ranges":["<0.17.14"],"fixed":["0.17.14"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}