CVE-2026-118265

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{"affected": [{"affectedData": [{"product": "echo", "vendor": "labstack", "versions": [{"status": "affected", "version": ">= 5.0.0, < 5.4.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's ExtractIPFromRealIPHeader validates whether the client-supplied X-Real-IP value belongs to a trusted range instead of validating the direct network peer. A client reaching Echo directly, or through a proxy that preserves the header, can supply a loopback or private address and have Context.RealIP return that spoofed identity. Applications using the extractor for IP allowlists, rate limiting, audit logs, or forwarding headers can consequently trust an attacker-controlled address; the default direct extractor and Echo v4 are unaffected. This issue is fixed in 5.4.1."}, {"lang": "es", "value": "Echo es un framework web de Go. Desde la versi\u00f3n 5.0.0 hasta la 5.4.1 incluida, la funci\u00f3n ExtractIPFromRealIPHeader de Echo v5 valida si el valor X-Real-IP suministrado por el cliente pertenece a un rango de confianza en lugar de validar el par de red directo. Un cliente que accede a Echo directamente, o a trav\u00e9s de un proxy que conserva la cabecera, puede proporcionar una direcci\u00f3n de bucle invertido o privada y hacer que Context.RealIP devuelva esa identidad suplantada. Las aplicaciones que utilizan el extractor para listas blancas de IP, limitaci\u00f3n de velocidad, registros de auditor\u00eda o cabeceras de reenv\u00edo pueden, en consecuencia, confiar en una direcci\u00f3n controlada por el atacante; el extractor directo predeterminado y Echo v4 no se ven afectados. Este problema est\u00e1 solucionado en la versi\u00f3n 5.4.1."}], "id": "CVE-2026-118265", "lastModified": "2026-11-04T23:10:00.223", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-118265", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-29T15:43:31.934498Z", "version": "2.0.3"}}]}, "published": "2026-10-28T19:17:31.377", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae"}, {"source": "security-advisories@github.com", "url": "https://github.com/labstack/echo/releases/tag/v5.4.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-348"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "github.com/labstack/echo: Echo: IP address spoofing via improper X-Real-IP header validation", "id": "2563139", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2563139"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-348", "details": ["Echo is a Go web framework. From 5.0.0 until 5.4.1, Echo v5's ExtractIPFromRealIPHeader validates whether the client-supplied X-Real-IP value belongs to a trusted range instead of validating the direct network peer. A client reaching Echo directly, or through a proxy that preserves the header, can supply a loopback or private address and have Context.RealIP return that spoofed identity. Applications using the extractor for IP allowlists, rate limiting, audit logs, or forwarding headers can consequently trust an attacker-controlled address; the default direct extractor and Echo v4 are unaffected. This issue is fixed in 5.4.1.", "A flaw was found in the Echo web framework. A remote attacker can spoof their client Internet Protocol (IP) address by sending a crafted request with an arbitrary X-Real-IP header, such as an internal or loopback address. Because the framework checks whether the header value itself falls within a trusted range rather than validating the direct network connection, applications relying on this extractor accept the forged identity. This may allow an attacker to bypass IP-based access restrictions and rate limits or corrupt security audit logs."], "name": "CVE-2026-118265", "public_date": "2026-10-28T19:03:56Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-118265\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-118265\nhttps://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae\nhttps://github.com/labstack/echo/releases/tag/v5.4.1\nhttps://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg"], "statement": "This vulnerability is rated with Moderate severity because, although an unauthenticated remote attacker can spoof client identity, exploitation requires applications to explicitly opt in to the non-default X-Real-IP extractor without upstream proxy sanitization. Under default configurations, services rely on direct connection extraction and remain unaffected. Furthermore, the risk is confined to bypassing IP-based restrictions, evading rate limits, or spoofing audit logs, rather than enabling code execution or compromising host confidentiality.", "threat_severity": "Moderate"}

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