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"metrics": [
{
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"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5,
"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",
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"content": {
"id": "CVE-2026-35188",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-06-10T03:59:37.106557Z",
"version": "2.0.3"
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"dateUpdated": "2026-06-10T20:02:41.587Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"title": "CISA ADP Vulnrichment"
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],
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"product": "OpenSSL",
"vendor": "OpenSSL",
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"status": "affected",
"version": "4.0.0",
"versionType": "semver"
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{
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"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": [
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"lang": "en",
"supportingMedia": [
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"value": "Issue summary: A malicious server can exploit TLS OCSP stapling by delivering\u003cbr\u003ea crafted response through the status_request extension, triggering a\u003cbr\u003edouble-free in the client\u0027s certificate verification path.\u003cbr\u003e\u003cbr\u003eImpact summary: Successful exploitation allows an attacker to corrupt heap\u003cbr\u003ememory via a double-free, potentially leading to a Denial of Service or\u003cbr\u003epossibly an attacker controlled code execution or other undefined behavior.\u003cbr\u003e\u003cbr\u003eIf OCSP stapling is enabled and the TLS client connects to a malicious server,\u003cbr\u003ea crafted OCSP stapled response can trigger a double free in the TLS client\u003cbr\u003ewhen the stapled response is checked.\u003cbr\u003e\u003cbr\u003eThe OCSP stapling is not enabled by default. Reliable code execution\u003cbr\u003ethrough a double-free is technically complex and highly environment-dependent\u003cbr\u003ebut the Denial of Service impact is straightforward to achieve, warranting\u003cbr\u003eModerate severity.\u003cbr\u003e\u003cbr\u003eNo FIPS modules are affected by this issue as the affected code is outside\u003cbr\u003ethe 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\u0027s 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."
}
],
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"format": "other",
"other": {
"content": {
"text": "Moderate"
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"type": "https://openssl-library.org/policies/general/security-policy/"
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}
],
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"descriptions": [
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"cweId": "CWE-415",
"description": "CWE-415 Double Free",
"lang": "en",
"type": "CWE"
}
]
}
],
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"dateUpdated": "2026-06-10T07:47:57.674Z",
"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5",
"shortName": "openssl"
},
"references": [
{
"name": "OpenSSL Advisory",
"tags": [
"vendor-advisory"
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"url": "https://openssl-library.org/news/secadv/20260609.txt"
},
{
"name": "4.0.1 git commit",
"tags": [
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"url": "https://github.com/openssl/openssl/commit/78d0154cffda03aaaac63a087cc523a6b35fa8fd"
},
{
"name": "3.6.3 git commit",
"tags": [
"patch"
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"url": "https://github.com/openssl/openssl/commit/131145d25659e8749a9ed1afb383484854cffb78"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "Double-free When Checking OCSP Stapled Response",
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"assignerShortName": "openssl",
"cveId": "CVE-2026-35188",
"datePublished": "2026-06-09T16:03:24.395Z",
"dateReserved": "2026-04-01T17:36:26.323Z",
"dateUpdated": "2026-06-10T20:02:41.587Z",
"state": "PUBLISHED"
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}