{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-73551",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-12T20:53:46.380Z",
        "datePublished": "2026-09-21T20:17:02.620Z",
        "dateUpdated": "2026-09-21T20:17:02.620Z"
    },
    "containers": {
        "cna": {
            "title": "Envoy: Path normalization does not handle dot and dotdot segments with parameters",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-647",
                            "lang": "en",
                            "description": "CWE-647: Use of Non-Canonical URL Paths for Authorization Decisions",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-2w8w-rfw7-8gg4"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/commit/28b6d60a6d96edeece121cac5be701eb46cc7f24"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/commit/d40a68b0a30a003c4e0a9fd3af637f828b52c37b"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/commit/e9d6c329f9a3ff19432bf39b60c601df7e3eda33"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/commit/f74d1107c4f5c9679b66f7a03a6c5b75ddde1989"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.36.10"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.37.6"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.38.4"
                },
                {
                    "name": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/envoyproxy/envoy/releases/tag/v1.39.1"
                }
            ],
            "affected": [
                {
                    "vendor": "envoyproxy",
                    "product": "envoy",
                    "versions": [
                        {
                            "version": "< 1.36.10",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.37.0, < 1.37.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.38.0, < 1.38.4",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.39.0, < 1.39.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-21T20:17:02.620Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's URL normalization does not recognize dot and dotdot path segments when they carry semicolon parameters. A request such as /user/..;foo=bar/admin is therefore not canonicalized to /admin even when path normalization is enabled. If an upstream interprets the segment according to RFC 3986 while Envoy applies routing or RBAC to the uncollapsed path, a remote client can cause path confusion and bypass path-based security policy. The relevant scope boundary is that the security consequence depends on a downstream/upstream path interpretation mismatch or a path-based Envoy decision. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1."
                }
            ],
            "source": {
                "advisory": "GHSA-2w8w-rfw7-8gg4",
                "discovery": "UNKNOWN"
            }
        }
    }
}