{"cve":{"cve_id":"CVE-2026-35188","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00245,"epss_percentile":0.15426,"epss_as_of":"2026-06-23","description":"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.","published_at":"2026-06-09T16:03:24.395000Z","last_modified_at":null,"cvss_v3_score":5.0,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-415"],"nvd_references":["https://openssl-library.org/news/secadv/20260609.txt","https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd","https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:30:01.813911Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"L","value_label":"Low"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"L","value_label":"Low"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"L","value_label":"Low"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"4.0.0","version_start_inclusive":true,"version_end":"4.0.1","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:4.0.0:4.0.1"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"3.6.0","version_start_inclusive":true,"version_end":"3.6.3","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:3.6.0:3.6.3"}],"exploit_refs":[],"news":[],"references":[{"url":"https://openssl-library.org/news/secadv/20260609.txt","source_type":"MISC","tags":[]},{"url":"https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-09T16:03:24.395000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:53:30.970244Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:30.970244Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:53:30.970244Z","label":"CVSS score revised","source":"cvelistv5"}]}