{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-63381",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-16T17:39:30.171Z",
        "datePublished": "2026-08-20T17:50:09.322Z",
        "dateUpdated": "2026-08-20T17:50:09.322Z"
    },
    "containers": {
        "cna": {
            "title": "Libevent: Dangling Pointer in `evbuffer_add_buffer_reference`",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-908",
                            "lang": "en",
                            "description": "CWE-908: Use of Uninitialized Resource",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "LOCAL",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.8,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-cg4r-88c8",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/libevent/libevent/security/advisories/GHSA-c2pj-cg4r-88c8"
                },
                {
                    "name": "https://github.com/libevent/libevent/commit/5cb95ba2f804f8aff46f88d58391c71e1251cd1c",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libevent/libevent/commit/5cb95ba2f804f8aff46f88d58391c71e1251cd1c"
                },
                {
                    "name": "https://github.com/libevent/libevent/commit/9db091b04f569be3a700fa9860ef02f90b830af9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libevent/libevent/commit/9db091b04f569be3a700fa9860ef02f90b830af9"
                },
                {
                    "name": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/libevent/libevent/releases/tag/release-2.1.13-stable"
                },
                {
                    "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": ">= 2.2.0-alpha, < 2.2.2-alpha",
                            "status": "affected"
                        },
                        {
                            "version": "< 2.1.13",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-20T17:50:09.322Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent has a use-after-free in buffer.c when evbuffer_add_buffer_reference processes an output buffer whose out_total_len is zero. evbuffer_free_all_chains frees the initial empty chain without resetting outbuf->first, outbuf->last, or outbuf->last_with_datap, and APPEND_CHAIN_MULTICAST subsequently dereferences the dangling chain pointer. A caller that can drive this buffer state can cause memory corruption or a process crash. This issue is fixed in versions 2.1.13 and 2.2.2-alpha."
                }
            ],
            "source": {
                "advisory": "GHSA-c2pj-cg4r-88c8",
                "discovery": "UNKNOWN"
            }
        }
    }
}