CVE-2026-97629

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An attacker could leverage this vulnerability to bypass verification of client certificates.\n\nImpact\n\n\nThis vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "Description<br>When NGINX Plus or NGINX Open Source is configured with&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">ssl_session_cache \n\n<b>shared</b><span style=\"background-color: rgb(255, 255, 255);\">:name:size</span>\n\nwithout an explicit ssl_session_ticket_key file</span>&nbsp;directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions \n\nin a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.<br><br>Impact<br>\n\n<div><span style=\"background-color: rgb(255, 255, 255);\">This vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.</span><br></div><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}]}], "references": [{"url": "https://my.f5.com/manage/s/article/K000162606", "tags": ["vendor-advisory"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "NONE", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"version": "4.0", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "subAvailabilityImpact": "NONE", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "baseSeverity": "HIGH", "baseScore": 8.3, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N"}}], "workarounds": [{"lang": "en", "value": "Do not enable automatic rotation of SSL session ticket keys: \n\noption a) remove the \"ssl_session_cache shared:name:size\" directive;\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache \n\noption b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key \n\nSystems that disable session tickets (\"ssl_session_tickets off;\") are not affected.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<span style=\"background-color: rgb(255, 255, 255);\">Do not enable automatic rotation of SSL session ticket keys: <br><br>option a) remove the \"ssl_session_cache </span><b>shared</b><span style=\"background-color: rgb(255, 255, 255);\">:name:size\" directive;<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache</a> <br><br>option b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key</a> <br><br>Systems that disable session tickets (\"ssl_session_tickets off;\") are not affected.<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets</a></span>"}]}], "credits": [{"lang": "en", "value": "F5 acknowledges PhiNode Labs, Gyejin Lee (QED Audit), Liviu-Alexandru Bud & Marc Luchian, Anthropic & Ada Logics, and Vivek Parikh of Zero-Day Research Labs for bringing this issue to our attention and following the highest standards of coordinated disclosure.", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "F5 SIRTBot v1.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-97629", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-10-15T15:52:47.244695Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T16:43:47.036Z"}}]}}

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Open Source", "versions": [{"status": "affected", "version": "1.31.0", "lessThan": "1.31.7", "versionType": "custom"}, {"status": "affected", "version": "1.30.0", "lessThan": "1.30.6", "versionType": "custom"}, {"status": "affected", "version": "1.23.3", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "datePublic": "2026-10-14T14:00:00.000Z", "references": [{"url": "https://my.f5.com/manage/s/article/K000162606", "tags": ["vendor-advisory"]}], "workarounds": [{"lang": "en", "value": "Do not enable automatic rotation of SSL session ticket keys: \n\noption a) remove the \"ssl_session_cache shared:name:size\" directive;\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache \n\noption b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key \n\nSystems that disable session tickets (\"ssl_session_tickets off;\") are not affected.\n https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets", "supportingMedia": [{"type": "text/html", "value": "<span style=\"background-color: rgb(255, 255, 255);\">Do not enable automatic rotation of SSL session ticket keys: <br><br>option a) remove the \"ssl_session_cache </span><b>shared</b><span style=\"background-color: rgb(255, 255, 255);\">:name:size\" directive;<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache</a> <br><br>option b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key</a> <br><br>Systems that disable session tickets (\"ssl_session_tickets off;\") are not affected.<br><a target=\"_blank\" rel=\"nofollow\" href=\"https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets\">https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets</a></span>", "base64": false}]}], "x_generator": {"engine": "F5 SIRTBot v1.0"}, "descriptions": [{"lang": "en", "value": "Description\nWhen NGINX Plus or NGINX Open Source is configured with\u00a0ssl_session_cache \n\nshared:name:size\n\nwithout an explicit ssl_session_ticket_key file\u00a0directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions \n\nin a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.\n\nImpact\n\n\nThis vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "supportingMedia": [{"type": "text/html", "value": "Description<br>When NGINX Plus or NGINX Open Source is configured with&nbsp;<span style=\"background-color: rgb(255, 255, 255);\">ssl_session_cache \n\n<b>shared</b><span style=\"background-color: rgb(255, 255, 255);\">:name:size</span>\n\nwithout an explicit ssl_session_ticket_key file</span>&nbsp;directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions \n\nin a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.<br><br>Impact<br>\n\n<div><span style=\"background-color: rgb(255, 255, 255);\">This vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.</span><br></div><br>\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-908", "description": "CWE-908 Use of Uninitialized Resource"}]}], "providerMetadata": {"orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-29T16:59:42.330Z"}}}, "cveMetadata": {"cveId": "CVE-2026-97629", "state": "PUBLISHED", "dateUpdated": "2026-10-29T16:59:42.330Z", "dateReserved": "2026-09-30T17:31:09.133Z", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "datePublished": "2026-10-14T14:40:26.740Z", "assignerShortName": "f5"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unknown", "modules": ["ngx_http_ssl_module"], "product": "NGINX Plus", "vendor": "F5", "versions": [{"lessThan": "37.1.0.1", "status": "affected", "version": "37.1.0", "versionType": "custom"}, {"lessThan": "37.0.5.1", "status": "affected", "version": "37.0.0", "versionType": "custom"}, {"lessThan": "*", "status": "affected", "version": "R36", "versionType": "custom"}, {"lessThan": "*", "status": "affected", "version": "R35", "versionType": "custom"}, {"lessThan": "*", "status": "affected", "version": "R34", "versionType": "custom"}, {"lessThan": "*", "status": "affected", "version": "R33", "versionType": "custom"}]}, {"defaultStatus": "unknown", "modules": ["ngx_http_ssl_module"], "product": "NGINX Open Source", "vendor": "F5", "versions": [{"lessThan": "1.31.7", "status": "affected", "version": "1.31.0", "versionType": "custom"}, {"lessThan": "1.30.6", "status": "affected", "version": "1.30.0", "versionType": "custom"}, {"lessThan": "*", "status": "affected", "version": "1.23.3", "versionType": "custom"}]}], "source": "f5sirt@f5.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Description\nWhen NGINX Plus or NGINX Open Source is configured with\u00a0ssl_session_cache \n\nshared:name:size\n\nwithout an explicit ssl_session_ticket_key file\u00a0directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions \n\nin a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.\n\nImpact\n\n\nThis vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}], "id": "CVE-2026-97629", "lastModified": "2026-10-15T17:17:33.410", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 4.2, "source": "f5sirt@f5.com", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "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:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/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": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "f5sirt@f5.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-97629", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T15:52:47.244695Z", "version": "2.0.3"}}]}, "published": "2026-10-14T15:17:28.600", "references": [{"source": "f5sirt@f5.com", "url": "https://my.f5.com/manage/s/article/K000162606"}], "sourceIdentifier": "f5sirt@f5.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "f5sirt@f5.com", "type": "Secondary"}]}

{"bugzilla": {"description": "nginx: nginx: Client certificate verification bypass via forged SSL sessions", "id": "2552364", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2552364"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N", "status": "draft"}, "cwe": "CWE-295", "details": ["Description\nWhen NGINX Plus or NGINX Open Source is configured with\u00a0ssl_session_cache \nshared:name:size\nwithout an explicit ssl_session_ticket_key file\u00a0directives to automatically rotate SSL session ticket keys, a remote unauthenticated attacker is able to forge client SSL sessions \nin a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.\nImpact\nThis vulnerability can lead to the exposure of resources or functionality to unintended actors, possibly providing attackers with access to sensitive information. There is no control plane exposure; this is a data plane issue only.\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.", "A flaw was found in nginx. Under specific configurations where shared SSL session caching is enabled without explicit session ticket key rotation, a remote unauthenticated attacker may be able to forge client Secure Sockets Layer (SSL) sessions. This flaw allows an attacker to bypass client certificate verification and gain unauthorized access to protected resources and sensitive information."], "name": "CVE-2026-97629", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "nginx", "product_name": "Red Hat Hardened Images"}, {"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Not affected", "package_name": "php", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-14T14:40:26Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-97629\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-97629\nhttps://my.f5.com/manage/s/article/K000162606"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.31.0,1.31.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.30.0,1.30.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[1.23.3,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Open Source", "source": "cna", "vendor": "F5"}, "product": "nginx_open_source", "vendor": "f5"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[37.1.0,37.1.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[37.0.0,37.0.5.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R36,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R35,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R34,*]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[R33,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "NGINX Plus", "source": "cna", "vendor": "F5"}, "product": "nginx_plus", "vendor": "f5"}], "created": "2026-10-15T01:15:10.448016+00:00", "updated": "2026-10-20T13:45:13.126117+00:00", "vendors": ["f5", "f5$PRODUCT$nginx_open_source", "f5$PRODUCT$nginx_plus"], "weaknesses": ["CWE-295", "CWE-908"]}