{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-35188",
        "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
        "state": "PUBLISHED",
        "assignerShortName": "openssl",
        "dateReserved": "2026-04-01T17:36:26.323Z",
        "datePublished": "2026-06-09T16:03:24.395Z",
        "dateUpdated": "2026-06-10T20:02:41.587Z"
    },
    "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": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
                "shortName": "openssl",
                "dateUpdated": "2026-06-10T07:47:57.674Z"
            },
            "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"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "cvssV3_1": {
                            "scope": "UNCHANGED",
                            "version": "3.1",
                            "baseScore": 5,
                            "attackVector": "NETWORK",
                            "baseSeverity": "MEDIUM",
                            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
                            "integrityImpact": "LOW",
                            "userInteraction": "NONE",
                            "attackComplexity": "HIGH",
                            "availabilityImpact": "LOW",
                            "privilegesRequired": "LOW",
                            "confidentialityImpact": "LOW"
                        }
                    },
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-10T03:59:37.106557Z",
                                "id": "CVE-2026-35188",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-06-10T20:02:41.587Z"
                }
            }
        ]
    }
}