{"id":"CVE-2026-42274","aliases":["GHSA-3q34-rx83-r6mq","GO-2026-5097"],"url":"https://o3.security/vulnerability/CVE-2026-42274","summary":"Heimdall: Authorization bypass via path normalization mismatch","details":"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.","published":"2026-05-08T03:43:41.597Z","modified":"2026-08-12T03:51:25.319690094Z","cvss":null,"epss":{"score":0.00368,"percentile":0.30485,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/dadrus/heimdall","fixedVersion":"0.17.14"}],"fix":{"url":"https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a","label":"dadrus/heimdall@b5dfa48"},"references":[{"type":"WEB","url":"https://github.com/dadrus/heimdall/releases/tag/v0.17.14"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42274.json"},{"type":"ADVISORY","url":"https://github.com/dadrus/heimdall/security/advisories/GHSA-3q34-rx83-r6mq"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42274"},{"type":"FIX","url":"https://github.com/dadrus/heimdall/commit/b5dfa484b7a8c2ce6d8691c026f9da867719947a"},{"type":"FIX","url":"https://github.com/dadrus/heimdall/pull/3209"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:25.319690094Z"}}