{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-118262",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-27T20:13:55.314Z",
        "datePublished": "2026-10-28T19:00:12.315Z",
        "dateUpdated": "2026-10-28T19:00:12.315Z"
    },
    "containers": {
        "cna": {
            "title": "Echo: WebSocket proxy can retain connections and handlers after client disconnect",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-772",
                            "lang": "en",
                            "description": "CWE-772: Missing Release of Resource after Effective Lifetime",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.2,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/labstack/echo/security/advisories/GHSA-9969-6676-49h5",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/labstack/echo/security/advisories/GHSA-9969-6676-49h5"
                },
                {
                    "name": "https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaaec",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/commit/1855061e572ae9dab727c811d8382f266bfbaaec"
                },
                {
                    "name": "https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/commit/3fb0ba7e17645bb65611e2a08875d0a2f65c421f"
                },
                {
                    "name": "https://github.com/labstack/echo/releases/tag/v4.16.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/releases/tag/v4.16.1"
                },
                {
                    "name": "https://github.com/labstack/echo/releases/tag/v5.4.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/labstack/echo/releases/tag/v5.4.1"
                }
            ],
            "affected": [
                {
                    "vendor": "labstack",
                    "product": "echo",
                    "versions": [
                        {
                            "version": ">= 4.15.0, < 4.16.1",
                            "status": "affected"
                        },
                        {
                            "version": ">= 5.0.0, < 5.4.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-28T19:00:12.315Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Echo is a Go web framework. From 4.15.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware can retain a handler, copy goroutines, and network connections after a WebSocket client disconnects when the upstream keeps its connection open. The raw proxy waits for both copy directions without reliably closing the peer connection when one direction ends, including when a rejected upgrade response uses HTTP keep-alive. Repeated connections can accumulate resources and cause denial of service, depending on proxy-route accessibility, upstream behavior, and connection deadlines. This issue is fixed in 4.16.1 and 5.4.1."
                }
            ],
            "source": {
                "advisory": "GHSA-9969-6676-49h5",
                "discovery": "UNKNOWN"
            }
        }
    }
}