{"cve":{"cve_id":"CVE-2026-9076","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":0.00297,"epss_percentile":0.21155,"epss_as_of":"2026-06-23","description":"Issue summary: When CMS password-based decryption (RFC 3211 / PWRI key unwrap)\nprocesses attacker-supplied CMS data, an attacker-chosen stream-mode KEK\ncipher can trigger a heap out-of-bounds read in kek_unwrap_key().\n\nImpact summary: A heap buffer over-read may trigger a crash which leads to\nDenial of Service for an application if the input buffer ends at a memory\npage boundary and the following page is unmapped. There is no information\ndisclosure as the over-read bytes are not revealed to the attacker.\n\nThe key unwrapping function performs a check-byte test as specified in the\nRFC that reads 7 bytes from a heap allocation that is based on the wrapped\nkey length from the message. There is a minimum length check based on the\nblock length of the wrapping cipher. However the cipher is selected from\nan OID carried in the attacker's PWRI keyEncryptionAlgorithm with no\nrequirement that the cipher be a block cipher. When an attacker selects\na stream-mode cipher the guard will be ineffective and the allocated buffer\ncontaining the unwrapped key can be too small to fit the check-bytes\nspecified in the RFC and a buffer over-read can happen.\n\nApplications calling CMS_decrypt() or CMS_decrypt_set1_password()\n(equivalently openssl cms -decrypt -pwri_password ...) on untrusted CMS\ndata are vulnerable to this issue. No password knowledge is required: the\nover-read happens during the unwrap attempt before any authentication\nsucceeds.\n\nThe over-read is limited to a few bytes and is not written to output, so\nthere is no information disclosure. Triggering a crash requires the\nallocation to border unmapped memory, which is unlikely with the normal\nallocator.\n\nThe FIPS modules are not affected by this issue.","published_at":"2026-06-09T16:03:16.306000Z","last_modified_at":null,"cvss_v3_score":7.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"HIGH","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-125"],"nvd_references":["https://openssl-library.org/news/secadv/20260609.txt","https://github.com/openssl/openssl/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0","https://github.com/openssl/openssl/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26","https://github.com/openssl/openssl/commit/715349a1d7c6db970e6815dafb90915f07307f98","https://github.com/openssl/openssl/commit/05b066366842f930fadd9a6e94df98030af431bb","https://github.com/openssl/openssl/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6"],"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":"2026-06-28T23:31:11.525114Z"},"effective_severity":"HIGH","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":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"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"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"3.5.0","version_start_inclusive":true,"version_end":"3.5.7","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:3.5.0:3.5.7"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"3.4.0","version_start_inclusive":true,"version_end":"3.4.6","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:3.4.0:3.4.6"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"3.0.0","version_start_inclusive":true,"version_end":"3.0.21","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:3.0.0:3.0.21"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"1.1.1","version_start_inclusive":true,"version_end":"1.1.1zh","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:1.1.1:1.1.1zh"},{"vendor_slug":"openssl","vendor_name":"OpenSSL","product_slug":"openssl","product_name":"OpenSSL","version_start":"1.0.2","version_start_inclusive":true,"version_end":"1.0.2zq","version_end_inclusive":false,"cpe23_uri":"cve5:openssl:openssl:1.0.2:1.0.2zq"}],"exploit_refs":[],"news":[],"references":[{"url":"https://openssl-library.org/news/secadv/20260609.txt","source_type":"MISC","tags":[]},{"url":"https://github.com/openssl/openssl/commit/3d8d5bc1056b2f62da9fede23fedbf47e85187b0","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/77bf00ab13f6ff5e516535432f0328ed70ec0c26","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/715349a1d7c6db970e6815dafb90915f07307f98","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/05b066366842f930fadd9a6e94df98030af431bb","source_type":"PATCH","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/eecbe330977e8d023aae1ca2d9bdbe983ef3fdc6","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2026-06-09T16:03:16.306000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:56:22.639448Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:56:22.639448Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:56:22.639448Z","label":"CVSS score revised","source":"cvelistv5"}]}