{"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"}}]}}

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{"cveTags": [], "descriptions": [{"lang": "en", "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."}], "id": "CVE-2026-35188", "lastModified": "2026-06-10T22:16:56.973", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.0, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 3.4, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2026-06-09T17:17:05.437", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260609.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0,4.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.6.0,3.6.3)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "OpenSSL", "source": "cna", "vendor": "OpenSSL"}, "product": "openssl", "vendor": "openssl"}], "created": "2026-06-09T17:30:10.517534+00:00", "updated": "2026-06-10T23:45:44.316768+00:00", "vendors": ["openssl", "openssl$PRODUCT$openssl"]}