{
    "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": "2026-09-30T19:49:15.429Z"
    },
    "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"
                }
            ]
        },
        "adp": [
            {
                "problemTypes": [
                    {
                        "descriptions": [
                            {
                                "type": "CWE",
                                "cweId": "CWE-416",
                                "lang": "en",
                                "description": "CWE-416 Use After Free"
                            }
                        ]
                    }
                ],
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 5.3,
                            "attackVector": "NETWORK",
                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                            "integrityImpact": "NONE",
                            "userInteraction": "NONE",
                            "attackComplexity": "LOW",
                            "availabilityImpact": "LOW",
                            "privilegesRequired": "NONE",
                            "confidentialityImpact": "NONE"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-30T19:49:10.823542Z",
                                "id": "CVE-2026-91095",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-09-30T19:49:15.429Z"
                }
            }
        ]
    }
}