{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-73260",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-08-11T17:18:01.598Z",
        "datePublished": "2026-10-14T18:25:00.518Z",
        "dateUpdated": "2026-10-14T18:25:00.518Z"
    },
    "containers": {
        "cna": {
            "title": "Mongoose: Out-of-bounds Read via length-counter underflow in built-in TLS X.509 DER parser",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-125",
                            "lang": "en",
                            "description": "CWE-125: Out-of-bounds Read",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.5,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/cesanta/mongoose/security/advisories/GHSA-f6wr-mg35-p25g",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/cesanta/mongoose/security/advisories/GHSA-f6wr-mg35-p25g"
                },
                {
                    "name": "https://github.com/cesanta/mongoose/commit/a8b4ae95db3c2db85e5ad9db3fefaeebb5f7b43e",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/cesanta/mongoose/commit/a8b4ae95db3c2db85e5ad9db3fefaeebb5f7b43e"
                },
                {
                    "name": "https://github.com/cesanta/mongoose/releases/tag/7.23",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/cesanta/mongoose/releases/tag/7.23"
                }
            ],
            "affected": [
                {
                    "vendor": "cesanta",
                    "product": "mongoose",
                    "versions": [
                        {
                            "version": "< 7.23",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-14T18:25:00.518Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Mongoose is an embedded web server and network library. Prior to 7.23, the built-in TLS certificate parser selected by MG_TLS_BUILTIN fails to verify that a long-form DER element length fits within the remaining certificate buffer. In mg_der_to_tlv() and mg_der_next(), a peer-controlled length can advance the parser beyond the certificate and underflow the remaining uint32_t length, causing mg_tls_parse_cert_der() to continue walking an invalid pointer. An unauthenticated malicious TLS server, or a client presenting a certificate to a server configured for client certificates, can trigger an out-of-bounds read and denial of service during the handshake. This issue is fixed in version 7.23."
                }
            ],
            "source": {
                "advisory": "GHSA-f6wr-mg35-p25g",
                "discovery": "UNKNOWN"
            }
        }
    }
}