{"id":"CVE-2026-118657","state":"PUBLISHED","title":"Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers","description":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Context.Scheme unconditionally trusts forwarded scheme headers from any client. A client that reaches Echo directly over plaintext HTTP can claim an HTTPS scheme and bypass HTTPSRedirect because the request is treated as already secure. Separately, behind a TLS-terminating proxy that passes an attacker-controlled header, a claimed HTTP scheme can suppress the Strict-Transport-Security header even though the browser receives the response over HTTPS. The practical risk is reduced when a trusted proxy overwrites the headers and direct backend access is prevented, but the framework previously had no trusted-source configuration for this decision. This issue is fixed in 4.16.0 and 5.4.0.","publishedAt":"2026-10-28T20:14:09.883Z","updatedAt":"2026-10-28T20:14:09.883Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["labstack echo"],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":">= 5.0.0, < 5.4.0","status":"affected"},{"version":"< 4.16.0","status":"affected"}]}],"references":["https://github.com/labstack/echo/security/advisories/GHSA-2ffq-g2xg-c22p","https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","https://github.com/labstack/echo/releases/tag/v4.16.0","https://github.com/labstack/echo/releases/tag/v5.4.0"],"weaknesses":["CWE-346"],"ingestedAt":"2026-10-29T20:10:52.580Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118657.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118657","state":"PUBLISHED","datePublished":"2026-10-28T20:14:09.883Z","dateUpdated":"2026-10-28T20:14:09.883Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-28T17:25:37.561Z"},"containers":{"cna":{"title":"Echo: HTTPS Redirect and HSTS Bypass via Unconditional Trust of Forwarded Scheme Headers","descriptions":[{"lang":"en","value":"Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, Context.Scheme unconditionally trusts forwarded scheme headers from any client. A client that reaches Echo directly over plaintext HTTP can claim an HTTPS scheme and bypass HTTPSRedirect because the request is treated as already secure. Separately, behind a TLS-terminating proxy that passes an attacker-controlled header, a claimed HTTP scheme can suppress the Strict-Transport-Security header even though the browser receives the response over HTTPS. The practical risk is reduced when a trusted proxy overwrites the headers and direct backend access is prevented, but the framework previously had no trusted-source configuration for this decision. This issue is fixed in 4.16.0 and 5.4.0."}],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":">= 5.0.0, < 5.4.0","status":"affected"},{"version":"< 4.16.0","status":"affected"}]}],"references":[{"url":"https://github.com/labstack/echo/security/advisories/GHSA-2ffq-g2xg-c22p","name":"https://github.com/labstack/echo/security/advisories/GHSA-2ffq-g2xg-c22p","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","name":"https://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","name":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/releases/tag/v4.16.0","name":"https://github.com/labstack/echo/releases/tag/v4.16.0","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/releases/tag/v5.4.0","name":"https://github.com/labstack/echo/releases/tag/v5.4.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-346","lang":"en","description":"CWE-346: Origin Validation Error","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T20:14:09.883Z"},"source":{"advisory":"GHSA-2ffq-g2xg-c22p","discovery":"UNKNOWN"}}}}}