{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "3.6.0"
              },
              {
                "fixed": "3.6.3"
              },
              {
                "introduced": "4.0.0-NA"
              },
              {
                "last_affected": "4.0.0-NA"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "7b371d80d959ec9ab4139d09d78e83c090de9779"
            },
            {
              "fixed": "aae016bfd52fcad2bc9657c2c782cfdf73b1ed5f"
            },
            {
              "introduced": "11b7b6ea3b65a584e1d31408ed1bdb139465cffd"
            },
            {
              "fixed": "131145d25659e8749a9ed1afb383484854cffb78"
            },
            {
              "fixed": "78d0154cffda03aaaac63a087cc523a6b35fa8fd"
            }
          ],
          "repo": "https://github.com/openssl/openssl",
          "type": "GIT"
        }
      ],
      "versions": [
        "4.0.0-NA"
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "openssl",
    "cwe_ids": [
      "CWE-415"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35188.json"
  },
  "details": "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.",
  "id": "CVE-2026-35188",
  "modified": "2026-07-15T01:49:08.528031625Z",
  "published": "2026-06-09T16:03:24.395Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35188.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-35188"
    },
    {
      "type": "ADVISORY",
      "url": "https://openssl-library.org/news/secadv/20260609.txt"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78"
    },
    {
      "type": "FIX",
      "url": "https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Double-free When Checking OCSP Stapled Response"
}