{"id":"CVE-2026-118651","sourceIdentifier":"security-advisories@github.com","published":"2026-10-28T20:17:22.073","lastModified":"2026-10-28T20:17:22.073","vulnStatus":"Received","cveTags":[],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"labstack","product":"echo","versions":[{"version":">= 4.0.0, < 5.4.0","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","baseScore":5.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Primary","description":[{"lang":"en","value":"CWE-346"}]}],"references":[{"url":"https://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af","source":"security-advisories@github.com"},{"url":"https://github.com/labstack/echo/releases/tag/v5.4.0","source":"security-advisories@github.com"},{"url":"https://github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36","source":"security-advisories@github.com"}]}