{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-91095",
        "assignerOrgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
        "state": "PUBLISHED",
        "assignerShortName": "Meta",
        "dateReserved": "2026-09-14T18:40:39.036Z",
        "datePublished": "2026-09-28T20:44:45.928Z",
        "dateUpdated": "2026-09-28T20:44:45.928Z"
    },
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "proxygen",
                    "vendor": "Facebook",
                    "versions": [
                        {
                            "lessThan": "v2026.09.28.00",
                            "status": "affected",
                            "version": "v2024.10.28.00",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "dateAssigned": "2026-09-14T00:00:00.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In proxygen from v2024.10.28.00 until v2026.09.28.00, the HTTPTransaction::onWebTransportUniStream and HTTPTransaction::onWebTransportBidiStream APIs could return stream handles that the stream handler had already freed. HQSession then installed those handles as transport read callbacks, which could lead to use of freed memory."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "description": "Use After Free (CWE-416)",
                            "lang": "en"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "4fc57720-52fe-4431-a0fb-3d2c8747b827",
                "shortName": "Meta",
                "dateUpdated": "2026-09-28T20:44:45.928Z"
            },
            "references": [
                {
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://www.facebook.com/security/advisories/cve-2026-91095"
                },
                {
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/facebook/proxygen/commit/479eb5574195764e80e6cedebef669f6baa85083"
                }
            ]
        }
    }
}