{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63074", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "state": "PUBLISHED", "assignerShortName": "openssl", "dateReserved": "2026-07-15T13:10:26.188Z", "datePublished": "2026-08-25T12:59:58.278Z", "dateUpdated": "2026-08-25T14:36:13.170Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.22", "status": "affected", "version": "3.0.0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "reporter", "value": "Pav\u043el \u017d\u00e1\u010dik (Red Hat)"}, {"lang": "en", "type": "remediation developer", "value": "Neil Horman"}], "datePublic": "2026-08-25T11:36:16.000Z", "descriptions": [{"lang": "en", "supportingMedia": [{"base64": false, "type": "text/html", "value": "Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches<br>additional certificates (extraCerts) sent in a CMP message, but never expunges<br>them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX<br>frequently, this cache of extraCerts may grow unboundedly, and a malicious<br>client may flood a CMP server with requests driving this growth.<br><br>Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX<br>for the lifetime of a server process may observe unbounded memory growth in the<br>event a malicious client repeatedly sends requests containing unique extra<br>certificates, which may lead to OOM conditions.<br><br>CWE: CWE-770: Allocation of Resources Without Limits or Throttling<br><br>Description: If a remote user sends CMP messages to a server with a list of<br>extraCerts and the message is rejected, the extraCerts from the message remains<br>in the server contexts untrusted certificate stack. This exposes servers with<br>long lived ctx objects to Denial of Service attacks in which an attacker sends<br>messages intending to be rejected with a large list of additional certificates<br>repeatedly, forcing the server to store them indefinitely.<br> <br>The issue was fixed by removing the added extra certs if the message is<br>rejected, using the same method as when the context is configured to not do<br>caching at all.<br><br>FIPS impact: no<br>As the CMP code lives outside the FIPS module boundary, no FIPS<br>modules are affected by this CVE."}], "value": "Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches\nadditional certificates (extraCerts) sent in a CMP message, but never expunges\nthem (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX\nfrequently, this cache of extraCerts may grow unboundedly, and a malicious\nclient may flood a CMP server with requests driving this growth.\n\nImpact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX\nfor the lifetime of a server process may observe unbounded memory growth in the\nevent a malicious client repeatedly sends requests containing unique extra\ncertificates, which may lead to OOM conditions.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: If a remote user sends CMP messages to a server with a list of\nextraCerts and the message is rejected, the extraCerts from the message remains\nin the server contexts untrusted certificate stack. This exposes servers with\nlong lived ctx objects to Denial of Service attacks in which an attacker sends\nmessages intending to be rejected with a large list of additional certificates\nrepeatedly, forcing the server to store them indefinitely.\n \nThe issue was fixed by removing the added extra certs if the message is\nrejected, using the same method as when the context is configured to not do\ncaching at all.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE."}], "metrics": [{"format": "other", "other": {"content": {"text": "Low"}, "type": "https://openssl-library.org/policies/general/security-policy/"}}], "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T12:59:58.278Z"}, "references": [{"name": "OpenSSL Advisory", "tags": ["vendor-advisory"], "url": "https://openssl-library.org/news/secadv/20260825.txt"}, {"name": "4.0.2 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/74ae7f6df47a5767c1010b88c47507dfc5b32c46"}, {"name": "3.6.4 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/01e567978a55fba18142a230380c31296049fae7"}, {"name": "3.5.8 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/75360af9650d4e0c82ba0050c5c9912cd79e54af"}, {"name": "3.4.7 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/f636f9ca0fa1bae5b42f9e787f025c96fb09c43a"}, {"name": "3.0.22 git commit", "tags": ["patch"], "url": "https://github.com/openssl/openssl/commit/21a5d9658b0c66daace60e10ea18ff32a448de9f"}], "source": {"discovery": "UNKNOWN"}, "title": "CMP Indefinite Cache Growth of ExtraCerts", "x_generator": {"engine": "Vulnogram 0.2.0"}}, "adp": [{"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"timestamp": "2026-08-25T14:36:10.702053Z", "id": "CVE-2026-63074", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-08-25T14:36:13.170Z"}}]}}

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If a server reuses an OSSL_CMP_CTX\nfrequently, this cache of extraCerts may grow unboundedly, and a malicious\nclient may flood a CMP server with requests driving this growth.\n\nImpact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX\nfor the lifetime of a server process may observe unbounded memory growth in the\nevent a malicious client repeatedly sends requests containing unique extra\ncertificates, which may lead to OOM conditions.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: If a remote user sends CMP messages to a server with a list of\nextraCerts and the message is rejected, the extraCerts from the message remains\nin the server contexts untrusted certificate stack. This exposes servers with\nlong lived ctx objects to Denial of Service attacks in which an attacker sends\nmessages intending to be rejected with a large list of additional certificates\nrepeatedly, forcing the server to store them indefinitely.\n \nThe issue was fixed by removing the added extra certs if the message is\nrejected, using the same method as when the context is configured to not do\ncaching at all.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE.", "supportingMedia": [{"type": "text/html", "value": "Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches<br>additional certificates (extraCerts) sent in a CMP message, but never expunges<br>them (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX<br>frequently, this cache of extraCerts may grow unboundedly, and a malicious<br>client may flood a CMP server with requests driving this growth.<br><br>Impact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX<br>for the lifetime of a server process may observe unbounded memory growth in the<br>event a malicious client repeatedly sends requests containing unique extra<br>certificates, which may lead to OOM conditions.<br><br>CWE: CWE-770: Allocation of Resources Without Limits or Throttling<br><br>Description: If a remote user sends CMP messages to a server with a list of<br>extraCerts and the message is rejected, the extraCerts from the message remains<br>in the server contexts untrusted certificate stack. This exposes servers with<br>long lived ctx objects to Denial of Service attacks in which an attacker sends<br>messages intending to be rejected with a large list of additional certificates<br>repeatedly, forcing the server to store them indefinitely.<br> <br>The issue was fixed by removing the added extra certs if the message is<br>rejected, using the same method as when the context is configured to not do<br>caching at all.<br><br>FIPS impact: no<br>As the CMP code lives outside the FIPS module boundary, no FIPS<br>modules are affected by this CVE.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-770", "description": "CWE-770 Allocation of Resources Without Limits or Throttling"}]}], "providerMetadata": {"orgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "shortName": "openssl", "dateUpdated": "2026-08-25T12:59:58.278Z"}}}, "cveMetadata": {"cveId": "CVE-2026-63074", "state": "PUBLISHED", "dateUpdated": "2026-08-25T14:36:13.170Z", "dateReserved": "2026-07-15T13:10:26.188Z", "assignerOrgId": "3a12439a-ef3a-4c79-92e6-6081a721f1e5", "datePublished": "2026-08-25T12:59:58.278Z", "assignerShortName": "openssl"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "OpenSSL", "vendor": "OpenSSL", "versions": [{"lessThan": "4.0.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "3.6.4", "status": "affected", "version": "3.6.0", "versionType": "semver"}, {"lessThan": "3.5.8", "status": "affected", "version": "3.5.0", "versionType": "semver"}, {"lessThan": "3.4.7", "status": "affected", "version": "3.4.0", "versionType": "semver"}, {"lessThan": "3.0.22", "status": "affected", "version": "3.0.0", "versionType": "semver"}]}], "source": "openssl-security@openssl.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Issue summary: The OpenSSL Certificate Management Protocol (CMP) caches\nadditional certificates (extraCerts) sent in a CMP message, but never expunges\nthem (for instance if they are invalid). If a server reuses an OSSL_CMP_CTX\nfrequently, this cache of extraCerts may grow unboundedly, and a malicious\nclient may flood a CMP server with requests driving this growth.\n\nImpact summary: Users utilizing a CMP server that reuses a single OSSL_CMP_CTX\nfor the lifetime of a server process may observe unbounded memory growth in the\nevent a malicious client repeatedly sends requests containing unique extra\ncertificates, which may lead to OOM conditions.\n\nCWE: CWE-770: Allocation of Resources Without Limits or Throttling\n\nDescription: If a remote user sends CMP messages to a server with a list of\nextraCerts and the message is rejected, the extraCerts from the message remains\nin the server contexts untrusted certificate stack. This exposes servers with\nlong lived ctx objects to Denial of Service attacks in which an attacker sends\nmessages intending to be rejected with a large list of additional certificates\nrepeatedly, forcing the server to store them indefinitely.\n \nThe issue was fixed by removing the added extra certs if the message is\nrejected, using the same method as when the context is configured to not do\ncaching at all.\n\nFIPS impact: no\nAs the CMP code lives outside the FIPS module boundary, no FIPS\nmodules are affected by this CVE."}], "id": "CVE-2026-63074", "lastModified": "2026-08-28T19:46:29.323", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63074", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-25T14:36:10.702053Z", "version": "2.0.3"}}]}, "published": "2026-08-25T13:19:26.283", "references": [{"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/01e567978a55fba18142a230380c31296049fae7"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/21a5d9658b0c66daace60e10ea18ff32a448de9f"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/74ae7f6df47a5767c1010b88c47507dfc5b32c46"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/75360af9650d4e0c82ba0050c5c9912cd79e54af"}, {"source": "openssl-security@openssl.org", "url": "https://github.com/openssl/openssl/commit/f636f9ca0fa1bae5b42f9e787f025c96fb09c43a"}, {"source": "openssl-security@openssl.org", "url": "https://openssl-library.org/news/secadv/20260825.txt"}], "sourceIdentifier": "openssl-security@openssl.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "openssl-security@openssl.org", "type": "Secondary"}]}

{"bugzilla": {"description": "openssl: CMP indefinite cache growth of ExtraCerts", "id": "2517566", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517566"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-770", "details": ["A flaw was found in OpenSSL. The CMP (Certificate Management Protocol) implementation does not clear cached additional certificates when an invalid message is received, leading to excessive memory consumption. This allows a malicious client to repeatedly send requests containing unique extra certificates to cause memory exhaustion, eventually resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-63074", "package_state": [{"cpe": "cpe:/a:redhat:rhdh:1", "fix_state": "Fix deferred", "package_name": "rhdh/rhdh-hub-rhel9", "product_name": "Red Hat Developer Hub"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "ovmf", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "shim-signed", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "compat-openssl10", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "mingw-openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "compat-openssl11", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "edk2", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim-unsigned-aarch64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "shim-unsigned-x64", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "openssl3", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "unbound", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Fix deferred", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "openvox-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "puppet-agent", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:rhel_satellite_client:6::el7", "fix_state": "Fix deferred", "package_name": "openvox-agent", "product_name": "Red Hat Satellite Client"}, {"cpe": "cpe:/a:redhat:rhel_satellite_client:6::el7", "fix_state": "Not affected", "package_name": "puppet-agent", "product_name": "Red Hat Satellite Client"}], "public_date": "2026-08-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63074\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63074\nhttps://openssl-library.org/news/secadv/20260825.txt"], "statement": "To exploit this flaw, an attacker needs to repeatedly send invalid messages containing additional certificates to a CMP server. However, this issue only affects CMP servers with long-lived context objects. This can grow the extra certificates cache and cause excessive memory consumption, eventually resulting in a denial of service. For these reasons, this vulnerability has been rated with a low severity.", "threat_severity": "Low"}