{"cve":"CVE-2026-42272","nvd":{"published":"2026-05-08T04:16:22.013","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 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.","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/8b0de6aba23a047cfee3081df878271bb17f4351","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"],"products":[],"source":"nvd","synced_at":"2026-10-26T20:34:58.897451322+00:00"},"epss":{"cve":"CVE-2026-42272","score":0.00396,"percentile":0.33561,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-43jv-5j4x-qv67","url":"https://osv.dev/vulnerability/GHSA-43jv-5j4x-qv67","summary":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation","modified":"2026-06-25T18:56:31.051350349Z","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-2026-5108","url":"https://osv.dev/vulnerability/GO-2026-5108","summary":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation in github.com/dadrus/heimdall","modified":"2026-06-25T18:45:20.961123149Z","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."]}