{
    "containers": {
        "cna": {
            "affected": [
                {
                    "defaultStatus": "unaffected",
                    "product": "OpenSSL",
                    "vendor": "OpenSSL",
                    "versions": [
                        {
                            "lessThan": "4.0.1",
                            "status": "affected",
                            "version": "4.0.0",
                            "versionType": "semver"
                        },
                        {
                            "lessThan": "3.6.3",
                            "status": "affected",
                            "version": "3.6.0",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Wang Kenaz (University of Illinois)"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Guido Vranken (Aisle Research)"
                },
                {
                    "lang": "en",
                    "type": "reporter",
                    "value": "Aaron Grattafiori (Nvidia)"
                },
                {
                    "lang": "en",
                    "type": "remediation developer",
                    "value": "Daniel Kubec"
                }
            ],
            "datePublic": "2026-06-09T14:00:00.000Z",
            "descriptions": [
                {
                    "lang": "en",
                    "supportingMedia": [
                        {
                            "base64": false,
                            "type": "text/html",
                            "value": "Issue summary: A malicious server can exploit TLS OCSP stapling by delivering<br>a crafted response through the status_request extension, triggering a<br>double-free in the client's certificate verification path.<br><br>Impact summary: Successful exploitation allows an attacker to corrupt heap<br>memory via a double-free, potentially leading to a Denial of Service or<br>possibly an attacker controlled code execution or other undefined behavior.<br><br>If OCSP stapling is enabled and the TLS client connects to a malicious server,<br>a crafted OCSP stapled response can trigger a double free in the TLS client<br>when the stapled response is checked.<br><br>The OCSP stapling is not enabled by default. Reliable code execution<br>through a double-free is technically complex and highly environment-dependent<br>but the Denial of Service impact is straightforward to achieve, warranting<br>Moderate severity.<br><br>No FIPS modules are affected by this issue as the affected code is outside<br>the OpenSSL FIPS module boundary."
                        }
                    ],
                    "value": "Issue summary: A malicious server can exploit TLS OCSP stapling by delivering\na crafted response through the status_request extension, triggering a\ndouble-free in the client's certificate verification path.\n\nImpact summary: Successful exploitation allows an attacker to corrupt heap\nmemory via a double-free, potentially leading to a Denial of Service or\npossibly an attacker controlled code execution or other undefined behavior.\n\nIf OCSP stapling is enabled and the TLS client connects to a malicious server,\na crafted OCSP stapled response can trigger a double free in the TLS client\nwhen the stapled response is checked.\n\nThe OCSP stapling is not enabled by default. Reliable code execution\nthrough a double-free is technically complex and highly environment-dependent\nbut the Denial of Service impact is straightforward to achieve, warranting\nModerate severity.\n\nNo FIPS modules are affected by this issue as the affected code is outside\nthe OpenSSL FIPS module boundary."
                }
            ],
            "metrics": [
                {
                    "format": "other",
                    "other": {
                        "content": {
                            "text": "Moderate"
                        },
                        "type": "https://openssl-library.org/policies/general/security-policy/"
                    }
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-415",
                            "description": "CWE-415 Double Free",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "00000000-0000-4000-9000-000000000000",
                "shortName": "openssl"
            },
            "references": [
                {
                    "name": "OpenSSL Advisory",
                    "tags": [
                        "vendor-advisory"
                    ],
                    "url": "https://openssl-library.org/news/secadv/20260609.txt"
                },
                {
                    "name": "4.0.1 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd"
                },
                {
                    "name": "3.6.3 git commit",
                    "tags": [
                        "patch"
                    ],
                    "url": "https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78"
                }
            ],
            "source": {
                "discovery": "UNKNOWN"
            },
            "title": "Double-free When Checking OCSP Stapled Response",
            "x_generator": {
                "engine": "Vulnogram 0.2.0"
            }
        }
    },
    "cveMetadata": {
        "assignerOrgId": "00000000-0000-4000-9000-000000000000",
        "cveId": "CVE-2026-35188",
        "requesterUserId": "00000000-0000-4000-9000-000000000000",
        "serial": 1,
        "state": "PUBLISHED"
    },
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1"
}