{"schemaVersion":3,"id":"CVE-2026-35188","aliases":["UBUNTU-CVE-2026-35188","DEBIAN-CVE-2026-35188","CGA-4jcv-8vv4-f437","CGA-639f-fw8c-3pg3","CGA-7pqx-5xh3-j5mw","CGA-mm8v-2mxp-4988","CGA-5w8x-x2x9-jmx2","CGA-5whp-rmpv-j4gv","CGA-65vj-2qg9-38w6","CGA-cf6q-g34p-9gwh","CGA-jh57-5gq2-ghj8","CGA-rpg2-w9vv-9q63"],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-06-09T16:03:24.395Z","modified":"2026-06-10T20:02:41.587Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5,"severity":"medium","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · 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3.6.3 | 4.0.0","eol":{"isEol":false,"eolDate":"2027-05-14T00:00:00.000Z","matchMethod":"cpe","cycle":{"name":"4.0","label":"4.0","eolFrom":"2027-05-14T00:00:00.000Z","isLts":false,"isMaintained":true,"latestVersion":"4.0.3"},"product":{"name":"openssl","label":"OpenSSL","category":"framework"}},"hubHref":"/vendor/openssl/openssl"}],"affectedCount":10,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://openssl-library.org/news/secadv/20260609.txt","label":"openssl-library.org/news/secadv/20260609.txt","hostname":"openssl-library.org","tags":["Vendor 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