{"id":"CVE-2026-118265","summary":"Echo: X-Real-IP extractor trusts the header value instead of the sending peer","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.","aliases":["GHSA-h53f-rm2w-w7rg"],"modified":"2026-10-29T10:45:57.739173273Z","published":"2026-10-28T19:03:56.934Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-348"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118265.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118265.json"},{"type":"FIX","url":"https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae"},{"type":"WEB","url":"https://github.com/labstack/echo/releases/tag/v5.4.1"},{"type":"ADVISORY","url":"https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118265"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/labstack/echo","events":[{"introduced":"9500f2745481e2dff1313e2e6734c488e80c13fb"},{"fixed":"a6a9673a54d2c719ceb32ce6a929d35483acfb2b"},{"fixed":"1855061e572ae9dab727c811d8382f266bfbaae"}],"database_specific":{"extracted_events":[{"range":[{"introduced":"5.0.0"},{"fixed":"5.4.1"}],"source":"AFFECTED_FIELD","strategy":"StringRangeExpression"},{"source":"REFERENCES_COMMIT","range":[{"fixed":"1855061e572ae9dab727c811d8382f266bfbaae"}]},{"original_tag":"v5.4.1","range":[{"fixed":"a6a9673a54d2c719ceb32ce6a929d35483acfb2b"}],"source":"REFERENCES_TAG"}]}}],"versions":["v5.4.0","v5.3.1","v5.3.0","v5.2.1","v5.2.0","v5.1.1","v5.1.0","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v5.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-118265.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"}]}