{"id":"CVE-2026-118651","summary":"Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default","details":"Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.","aliases":["GHSA-99jh-6h7p-pp36"],"modified":"2026-10-29T10:46:10.439922279Z","published":"2026-10-28T19:30:01.320Z","database_specific":{"cwe_ids":["CWE-346"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118651.json","cna_assigner":"GitHub_M"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118651.json"},{"type":"FIX","url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v5.4.0"},{"type":"ADVISORY","url":"https://github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118651"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/labstack/echo","events":[{"introduced":"6d9e043284aea2d07f5fcaf0d3a424eb7d9f6109"},{"fixed":"fc410094b2f3415cf2bf5204082137b205bfd5af"}],"database_specific":{"extracted_events":[{"strategy":"StringRangeExpression","range":[{"introduced":"4.0.0"},{"fixed":"5.4.0"}],"source":"AFFECTED_FIELD"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"fc410094b2f3415cf2bf5204082137b205bfd5af"}]},{"original_tag":"v5.4.0","range":[{"fixed":"fc410094b2f3415cf2bf5204082137b205bfd5af"}],"source":"REFERENCES_TAG"}]}}],"versions":["v5.3.1","v5.3.0","v5.2.1","v5.2.0","v5.1.1","v5.1.0","v5.0.4","v4.15.0","v5.0.3","v5.0.2","v5.0.1","v5.0.0","v4.14.0","v4.13.4","v4.13.3","v4.13.2","v4.13.1","v4.13.0","v4.12.0","v4.11.4","v4.11.3","v4.11.2","v4.11.1","v4.11.0","v4.10.2","v4.10.1","v4.10.0","v4.9.1","v4.9.0","v4.8.0","v4.7.2","v4.7.1","v4.7.0","v4.6.2","v4.6.1","v4.6.0","v4.5.0","v4.4.0","v4.3.0","v4.2.2","v4.2.1","v4.2.0","v4.1.17","v4.1.16","v4.1.15","v4.1.14","v4.1.13","v4.1.12","v4.1.11","v4.1.10","v4.1.9","v4.1.8","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118651.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N"}]}