{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63380",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-16T17:39:30.171Z",
        "datePublished": "2026-08-20T17:52:29.458Z",
        "dateUpdated": "2026-08-20T17:52:29.458Z"
    },
    "containers": {
        "cna": {
            "title": "Libevent: Null Pointer Dereference in `evws_new_session`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-416",
                            "lang": "en",
                            "description": "CWE-416: Use After Free",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-476",
                            "lang": "en",
                            "description": "CWE-476: NULL Pointer Dereference",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "LOCAL",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.7,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/libevent/libevent/security/advisories/GHSA-3rpf-frgx-xq34",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/libevent/libevent/security/advisories/GHSA-3rpf-frgx-xq34"
                },
                {
                    "name": "https://github.com/libevent/libevent/commit/825c18bd99f556b59d61200523237f264d5cc734",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libevent/libevent/commit/825c18bd99f556b59d61200523237f264d5cc734"
                },
                {
                    "name": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libevent/libevent/releases/tag/release-2.2.2-alpha"
                }
            ],
            "affected": [
                {
                    "vendor": "libevent",
                    "product": "libevent",
                    "versions": [
                        {
                            "version": "< 2.2.2-alpha",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T17:52:29.458Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Libevent is an event notification library. Prior to 2.2.2-alpha, libevent can dereference invalid list pointers in ws.c when evws_new_session enters its error path after evhttp_start_ws_ succeeds but bufferevent_enable_locking_ fails. evws_connection_free sees a non-null http_server and unconditionally calls TAILQ_REMOVE even though the session was never inserted into http_server->ws_sessions. A local caller able to induce this allocation or locking failure can crash the process. This issue is fixed in version 2.2.2-alpha."
                }
            ],
            "source": {
                "advisory": "GHSA-3rpf-frgx-xq34",
                "discovery": "UNKNOWN"
            }
        }
    }
}