{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-97629", "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "state": "PUBLISHED", "assignerShortName": "f5", "dateReserved": "2026-09-30T17:31:09.133Z", "datePublished": "2026-10-14T14:40:26.740Z", "dateUpdated": "2026-10-15T16:43:47.036Z" }, "containers": { "cna": { "affected": [ { "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" } ] } ], "credits": [ { "lang": "en", "type": "finder", "value": "F5 acknowledges PhiNode Labs for bringing this issue to our attention and following the highest standards of coordinated disclosure" } ], "datePublic": "2026-10-14T14:00:00.000Z", "descriptions": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "Description
When NGINX Plus or NGINX Open Source is configured with ssl_session_cache \n\nshared:name:size\n\nwithout an explicit ssl_session_ticket_key file 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.

Impact
\n\n
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.

\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated." } ], "value": "Description\nWhen NGINX Plus or NGINX Open Source is configured with ssl_session_cache \n\nshared:name:size\n\nwithout an explicit ssl_session_ticket_key file 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.\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." } ], "impacts": [ { "capecId": "CAPEC-59", "descriptions": [ { "lang": "en", "value": "CAPEC-59 Session Credential Falsification through Prediction" } ] } ], "metrics": [ { "cvssV3_1": { "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" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] }, { "cvssV4_0": { "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 8.3, "baseSeverity": "HIGH", "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", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED" }, "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ] } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-908", "description": "CWE-908 Use of Uninitialized Resource", "lang": "en", "type": "CWE" } ] } ], "providerMetadata": { "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab", "shortName": "f5", "dateUpdated": "2026-10-14T14:40:26.740Z" }, "references": [ { "tags": [ "vendor-advisory" ], "url": "https://my.f5.com/manage/s/article/K000162606" } ], "source": { "discovery": "EXTERNAL" }, "title": "NGINX ngx_http_ssl_module vulnerability", "workarounds": [ { "lang": "en", "supportingMedia": [ { "base64": false, "type": "text/html", "value": "Do not enable automatic rotation of SSL session ticket keys:

option a) remove the \"ssl_session_cache shared:name:size\" directive;
https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_cache

option b) switch to loading static ticket keys from a file using the \"ssl_session_ticket_key\" directive.
https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_ticket_key

Systems that disable session tickets (\"ssl_session_tickets off;\") are not affected.
https://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets" } ], "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" } ], "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" } } ] } }