{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-53507",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-09T17:05:25.059Z",
        "datePublished": "2026-08-31T18:57:41.097Z",
        "dateUpdated": "2026-08-31T18:57:41.097Z"
    },
    "containers": {
        "cna": {
            "title": "oasdiff actions resolve external $refs by default, enabling SSRF and disclosure of structured files on pull-request runs",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-918",
                            "lang": "en",
                            "description": "CWE-918: Server-Side Request Forgery (SSRF)",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1188",
                            "lang": "en",
                            "description": "CWE-1188: Insecure Default Initialization of Resource",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 8.3,
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/oasdiff/oasdiff-action/security/advisories/GHSA-fhj3-7267-7vv5",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/oasdiff/oasdiff-action/security/advisories/GHSA-fhj3-7267-7vv5"
                },
                {
                    "name": "https://github.com/oasdiff/oasdiff-action/pull/128",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oasdiff/oasdiff-action/pull/128"
                },
                {
                    "name": "https://github.com/oasdiff/oasdiff-action/pull/129",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oasdiff/oasdiff-action/pull/129"
                },
                {
                    "name": "https://github.com/oasdiff/oasdiff-action/pull/130",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/oasdiff/oasdiff-action/pull/130"
                }
            ],
            "affected": [
                {
                    "vendor": "oasdiff",
                    "product": "oasdiff-action",
                    "versions": [
                        {
                            "version": "< 0.0.51",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-31T18:57:41.097Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "oasdiff-action is a GitHub Action that detects breaking changes in OpenAPI specs and post a review on every pull request. Before version 0.0.51, the oasdiff actions resolved external $refs in the OpenAPI spec by default (allow-external-refs: true). When an action runs on a pull request whose spec is attacker-controlled — most importantly fork pull requests on public repositories — a $ref in that spec is fetched/read on the runner with no interaction required, enabling SSRF and disclosure of structured files on the runner. This issue has been patched in version 0.0.51."
                }
            ],
            "source": {
                "advisory": "GHSA-fhj3-7267-7vv5",
                "discovery": "UNKNOWN"
            }
        }
    }
}