{"id":"CVE-2026-118265","state":"PUBLISHED","title":"Echo: X-Real-IP extractor trusts the header value instead of the sending peer","description":"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.","publishedAt":"2026-10-28T19:03:56.934Z","updatedAt":"2026-10-29T20:54:10.718Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["labstack echo"],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":">= 5.0.0, < 5.4.1","status":"affected"}]}],"references":["https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg","https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae","https://github.com/labstack/echo/releases/tag/v5.4.1"],"weaknesses":["CWE-348"],"ingestedAt":"2026-10-29T23:14:04.755Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/118xxx/CVE-2026-118265.json","commit":"dc7676b3f67d6707e4927968546e7e0125ff7ec7","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-118265","state":"PUBLISHED","datePublished":"2026-10-28T19:03:56.934Z","dateUpdated":"2026-10-29T20:54:10.718Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-27T20:13:55.314Z"},"containers":{"cna":{"title":"Echo: X-Real-IP extractor trusts the header value instead of the sending peer","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."}],"affected":[{"vendor":"labstack","product":"echo","versions":[{"version":">= 5.0.0, < 5.4.1","status":"affected"}]}],"references":[{"url":"https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg","name":"https://github.com/labstack/echo/security/advisories/GHSA-h53f-rm2w-w7rg","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae","name":"https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaae","tags":["x_refsource_MISC"]},{"url":"https://github.com/labstack/echo/releases/tag/v5.4.1","name":"https://github.com/labstack/echo/releases/tag/v5.4.1","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-348","lang":"en","description":"CWE-348: Use of Less Trusted Source","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-28T19:03:56.934Z"},"source":{"advisory":"GHSA-h53f-rm2w-w7rg","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-29T15:43:31.934498Z","id":"CVE-2026-118265","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-29T20:54:10.718Z"}}]}}}