{"id":"CVE-2026-42272","revision":null,"records":[{"revision":"f070efd0d01c4787a0dffbf6ca49b0be","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-42272","aliases":[],"title":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation","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.","state":0,"publishedAt":"2026-05-08T03:40:17.541+00:00","modifiedAt":"2026-05-08T23:12:35.366+00:00","affected":[{"ecosystem":"Vendor product","name":"heimdall","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"dadrus\",\n                    \"product\": \"heimdall\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 0.17.14\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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,"severity":"HIGH"}],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67","https://github.com/dadrus/heimdall/pull/3207","https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-42272","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-42272","identifiers":["CVE-2026-42272"]},"retained":false,"historicalAffected":[]},{"revision":"a6ad791336c94ce490765503ae955449","observedAt":"2026-11-01T07:12:45.275+00:00","statement":{"source":"euvd","id":"EUVD-2026-28508","aliases":["CVE-2026-42272","GHSA-43jv-5j4x-qv67"],"title":"Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. 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This issue has been patched in version 0.17.14.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 4.0","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,"severity":null}],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67","https://github.com/dadrus/heimdall/pull/3207","https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-28508","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"May 8, 2026, 3:40:17 AM","dateUpdated":"May 8, 2026, 11:12:35 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. 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This issue has been patched in version 0.17.14.","state":0,"publishedAt":"2026-05-08T04:16:22.013+00:00","modifiedAt":"2026-10-26T20:10:00.16+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":7.8,"severity":"HIGH"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-42272","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-178","CWE-436"],"productCriteria":[],"sourceDates":{"published":"2026-05-08T04:16:22.013","lastModified":"2026-10-26T20:10:00.160"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-42272","identifiers":["CVE-2026-42272"]},"retained":false,"historicalAffected":[]},{"revision":"576ee85472a640689e5e7acc8fc78469","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-43jv-5j4x-qv67","aliases":["CVE-2026-42272","GO-2026-5108"],"title":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation","description":"### Summary\n\nHeimdall 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).\n\nThis discrepancy can lead to differences in how request paths are interpreted by heimdall and upstream components, which may result in authorization bypass.\n\n**Note:** The issue can only lead to unintended access if heimdall is configured with an \"allow all\" default rule. Since v0.16.0, heimdall enforces secure defaults and refuses to start with such a configuration unless this enforcement is explicitly disabled (e.g. via `--insecure-skip-secure-default-rule-enforcement` or the broader `--insecure` flag).\n\n### Details\n\nConsider the following rule configuration:\n\n```yaml\nid: rule-1\nmatch:\n  routes:\n    - path: /admin/**\nexecute: # configured to require authentication and authorization\n  # ...\n```\n\nIf an adversary sends a request such as `/admin%2fsecret`, neither is the above rule matched, nor is the request rejected (as would be expected when `allow_encoded_slashes` is set to `off`). Instead, the default rule (if configured) will be executed.\n\nIf the configured default rule is overly permissive (e.g. allowing anonymous access), and the upstream service interprets `%2f` as a path separator, the request may ultimately be processed as `/admin/secret`.\n\nThis results in the request being authorized based on a different path than the one processed by the upstream service, leading to authorization bypass.\n\n### Impact\n\nBypass of access control policies enforced by heimdall may lead to the following consequences:\n\n* Access to or modification of data that should be restricted\n* Invocation of functionality that is expected to require authentication or authorization\n* In certain configurations, escalation of privileges depending on the exposed functionality\n\n\n### Workarounds\n\n* Developers should not use the `--insecure` or the `--insecure-skip-secure-default-rule-enforcement` flags and configure their default rule to implement \"deny by default\".\n* Reject HTTP paths containing encoded slashes in the layers in front of heimdall. Some proxies, like e.g., Traefik, do that by default.\n* Include the ID of the rule expected to be executed in the JWT issued by heimdall and verify that value in the project's service.","state":0,"publishedAt":"2026-04-25T23:29:40+00:00","modifiedAt":"2026-06-25T18:56:31.0513503+00:00","affected":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.14"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"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":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67","https://nvd.nist.gov/vuln/detail/CVE-2026-42272","https://github.com/dadrus/heimdall/pull/3207","https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351","https://github.com/dadrus/heimdall","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://github.com/advisories/GHSA-43jv-5j4x-qv67","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-43jv-5j4x-qv67","identifiers":["GHSA-43jv-5j4x-qv67","CVE-2026-42272","GO-2026-5108"]},"retained":false,"historicalAffected":[]},{"revision":"4b2f8acc10334aef8cb2a156063ce2a0","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5108","aliases":["CVE-2026-42272","GHSA-43jv-5j4x-qv67"],"title":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation in github.com/dadrus/heimdall","description":"Heimdall: Case-sensitive handling of URL-encoded slashes may lead to inconsistent path interpretation in github.com/dadrus/heimdall","state":0,"publishedAt":"2026-06-25T18:26:48+00:00","modifiedAt":"2026-06-25T18:45:20.9611231+00:00","affected":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.17.14"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/dadrus/heimdall/security/advisories/GHSA-43jv-5j4x-qv67","https://nvd.nist.gov/vuln/detail/CVE-2026-42272","https://github.com/dadrus/heimdall/commit/8b0de6aba23a047cfee3081df878271bb17f4351","https://github.com/dadrus/heimdall/pull/3207","https://github.com/dadrus/heimdall/releases/tag/v0.17.14"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5108","license":"OSV · upstream source license applies","key":"osv:GO-2026-5108","identifiers":["GO-2026-5108","CVE-2026-42272","GHSA-43jv-5j4x-qv67"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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