CVE-2026-118656

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{"bugzilla": {"description": "github.com/labstack/echo: Echo: Open redirect via improper URI sanitization", "id": "2563177", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563177"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-601", "details": ["Echo is a Go web framework. Prior to 4.16.0 and 5.4.0, sanitizeURI checks only the first two bytes of a redirect target before deciding whether it begins with an absolute-path separator pair. When AddTrailingSlash or RemoveTrailingSlash is configured with a redirect status, a slash, TAB, separator path form can evade the guard, be emitted in the Location header, and be normalized by a browser into an attacker-controlled host. This issue is fixed in 4.16.0 and 5.4.0.", "A flaw was found in Echo. This vulnerability allows an open redirect to an untrusted domain due to improper validation of redirect targets during Uniform Resource Identifier (URI) sanitization. When trailing slash redirect middleware is configured, a specially crafted path containing tab characters can bypass validation checks. A remote attacker can exploit this flaw by enticing a user to visit a malicious link, redirecting them to an arbitrary external website to facilitate phishing attacks."], "name": "CVE-2026-118656", "public_date": "2026-10-28T20:12:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118656\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118656\nhttps://github.com/labstack/echo/commit/b838391e2eade87ae7e5a09d7bb5087bec271ec1\nhttps://github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af\nhttps://github.com/labstack/echo/releases/tag/v4.16.0\nhttps://github.com/labstack/echo/releases/tag/v5.4.0\nhttps://github.com/labstack/echo/security/advisories/GHSA-v753-g4cw-jm48"], "statement": "This vulnerability is rated as having Moderate severity because exploitation requires user interaction to follow an attacker-supplied link and is contingent on non-default middleware configurations. Within Red Hat environments, applications utilizing the Echo framework are only exposed if the trailing slash middleware is explicitly configured with an HTTP redirect status. In default configurations, the middleware performs internal URL rewrites instead of issuing external redirects, mitigating unauthenticated redirection risks.", "threat_severity": "Moderate"}

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