CVE-2026-85088

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That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a \"skip\" result rather than\n\na rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.\n\n\n\nRFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a\n\nCommon Name for another is therefore accepted for a connection to the second name.\n\n\n\nExploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host\n\nname. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.\n\n\n\nThis issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift.\n<br>\n<br>Both libraries install a default access manager for client sockets \u2014 TSSLSocketFactory does so in C++, and the accessManager property does so in D \u2014 which compares the peer certificate against the host\n<br>name that was connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a \"skip\" result rather than\n<br>a rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.\n<br>\n<br>RFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a\n<br>Common Name for another is therefore accepted for a connection to the second name.\n<br>\n<br>Exploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host\n<br>name. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.\n<br>\n<br>This issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0.</p>"}]}], "references": [{"url": "https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1", "tags": ["vendor-advisory"]}, {"url": "https://lists.apache.org/thread/zcgm7lx6037lvgvn87rc1tj3p0zhv371", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"scenarios": [{"lang": "en", "value": "GENERAL"}], "format": "CVSS", "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "UNREPORTED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 6.9, "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U"}}], "credits": [{"lang": "en", "value": "The ASF \u2014 found using Claude agents to study the security of open-source projects, validated and reported by Apache Thrift.", "type": "finder"}], "x_generator": {"engine": "Vulnogram 1.0.3"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-02T17:39:52.481593Z", "id": "CVE-2026-85088", "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": "2026-10-02T17:40:12.995Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-85088", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-02T17:39:52.481593Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-02T17:40:03.847Z"}}], "cna": {"title": "Apache Thrift, Apache Thrift: The C++ and D clients fall back to the certificate Common Name when subjectAltName entries are present but do not match", "source": {"discovery": "INTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "The ASF \u2014 found using Claude agents to study the security of open-source projects, validated and reported by Apache Thrift."}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "moderate"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}, {"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 6.9, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U", "exploitMaturity": "UNREPORTED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Thrift", "versions": [{"status": "affected", "version": "0", "lessThan": "0.25.0", "versionType": "semver"}], "packageURL": "pkg:conan/thrift", "packageName": "thrift", "collectionURL": "https://conan.io/center", "defaultStatus": "unaffected"}, {"vendor": "Apache Software Foundation", "product": "Apache Thrift", "versions": [{"status": "affected", "version": "0", "lessThan": "0.25.0", "versionType": "semver"}], "packageName": "D language bindings", "defaultStatus": "unaffected"}], "references": [{"url": "https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1", "tags": ["vendor-advisory"]}, {"url": "https://lists.apache.org/thread/zcgm7lx6037lvgvn87rc1tj3p0zhv371", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "Vulnogram 1.0.3"}, "descriptions": [{"lang": "en", "value": "Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift.\n\n\n\nBoth libraries install a default access manager for client sockets \u2014 TSSLSocketFactory does so in C++, and the accessManager property does so in D \u2014 which compares the peer certificate against the host\n\nname that was connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a \"skip\" result rather than\n\na rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.\n\n\n\nRFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a\n\nCommon Name for another is therefore accepted for a connection to the second name.\n\n\n\nExploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host\n\nname. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.\n\n\n\nThis issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0.", "supportingMedia": [{"type": "text/html", "value": "<p>Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift.\n<br>\n<br>Both libraries install a default access manager for client sockets \u2014 TSSLSocketFactory does so in C++, and the accessManager property does so in D \u2014 which compares the peer certificate against the host\n<br>name that was connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a \"skip\" result rather than\n<br>a rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.\n<br>\n<br>RFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a\n<br>Common Name for another is therefore accepted for a connection to the second name.\n<br>\n<br>Exploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host\n<br>name. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.\n<br>\n<br>This issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. 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{"affected": [{"affectedData": [{"collectionURL": "https://conan.io/center", "defaultStatus": "unaffected", "packageName": "thrift", "packageURL": "pkg:conan/thrift", "product": "Apache Thrift", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "0.25.0", "status": "affected", "version": "0", "versionType": "semver"}]}, {"defaultStatus": "unaffected", "packageName": "D language bindings", "product": "Apache Thrift", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "0.25.0", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Improper Validation of Certificate with Host Mismatch in the C++ and D libraries of Apache Thrift.\n\n\n\nBoth libraries install a default access manager for client sockets \u2014 TSSLSocketFactory does so in C++, and the accessManager property does so in D \u2014 which compares the peer certificate against the host\n\nname that was connected to. That comparison walks the subjectAltName dNSName entries first and consults the certificate Common Name afterwards. A name that does not match yields a \"skip\" result rather than\n\na rejection, so a certificate whose subjectAltName entries are all present and all non-matching falls through to the Common Name, which can then satisfy the check.\n\n\n\nRFC 6125 section 6.4.4, and RFC 9525 section 2, require that the Common Name is not consulted when a dNSName subjectAltName is present. A certificate carrying subjectAltName entries for one name and a\n\nCommon Name for another is therefore accepted for a connection to the second name.\n\n\n\nExploitation requires an attacker positioned on the network path who holds a certificate that chains to a certificate authority in the client's trust store and whose Common Name matches the connected host\n\nname. Public certificate authorities have not issued on Common Name alone for many years, so this is principally a concern for deployments using a private or enterprise public-key infrastructure.\n\n\n\nThis issue affects the C++ library of Apache Thrift from 0.7.0 through 0.24.0 and the D library from 0.9.0 through 0.24.0. Users should upgrade to 0.25.0."}], "id": "CVE-2026-85088", "lastModified": "2026-10-02T18:17:06.237", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "UNREPORTED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@apache.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-85088", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-02T17:39:52.481593Z", "version": "2.0.3"}}]}, "published": "2026-10-02T12:17:21.800", "references": [{"source": "security@apache.org", "url": "https://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1"}, {"source": "security@apache.org", "url": "https://lists.apache.org/thread/zcgm7lx6037lvgvn87rc1tj3p0zhv371"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-295"}, {"lang": "en", "value": "CWE-297"}], "source": "security@apache.org", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2026:74369", "cpe": "cpe:/a:redhat:hummingbird:1", "package": "thrift-main-0.25.0-0.1.hum1", "product_name": "Red Hat Hardened Images", "release_date": "2026-10-01T00:00:00Z"}], "bugzilla": {"description": "thrift: thrift: Man-in-the-middle attacks via improper certificate validation", "id": "2545088", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2545088"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "verified"}, "cwe": "CWE-295", "details": ["A flaw was found in Apache Thrift. During Transport Layer Security (TLS) certificate validation, the client libraries improperly evaluate the certificate's Common Name (CN) when subject alternative name (SAN) entries do not match the target host. A network-positioned attacker possessing a trusted certificate matching the host's Common Name can exploit this vulnerability to impersonate the legitimate server. Successful exploitation allows the attacker to intercept or tamper with encrypted communications."], "name": "CVE-2026-85088", "package_state": [{"cpe": "cpe:/a:redhat:ceph_storage:7", "fix_state": "Affected", "package_name": "thrift", "product_name": "Red Hat Ceph Storage 7"}, {"cpe": "cpe:/a:redhat:ceph_storage:8", "fix_state": "Affected", "package_name": "thrift", "product_name": "Red Hat Ceph Storage 8"}, {"cpe": "cpe:/a:redhat:ceph_storage:9", "fix_state": "Affected", "package_name": "thrift", "product_name": "Red Hat Ceph Storage 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_ai:3", "fix_state": "Affected", "package_name": "thrift", "product_name": "Red Hat Enterprise Linux AI (RHEL AI) 3"}], "public_date": "2026-10-02T11:37:14Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-85088\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-85088\nhttps://lists.apache.org/thread/33otcgbqd27wf6qq810q56znzbomnhg1\nhttps://lists.apache.org/thread/zcgm7lx6037lvgvn87rc1tj3p0zhv371"], "threat_severity": "Important"}

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