When NGINX Plus or NGINX Open Source is configured with ssl_session_cache
shared:name:size
without 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
in a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates.
Impact
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.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| F5 | NGINX Plus | unknown |
|
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| F5 | NGINX Open Source | unknown |
|
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Project Subscriptions
No data.
No advisories yet.
Solution
No solution given by the vendor.
Workaround
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
| Link | Providers |
|---|---|
| https://my.f5.com/manage/s/article/K000162606 |
|
Wed, 14 Oct 2026 15:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Description When NGINX Plus or NGINX Open Source is configured with ssl_session_cache shared:name:size without 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 in a non-deterministic manner that is beyond the attacker's control. An attacker could leverage this vulnerability to bypass verification of client certificates. Impact 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. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. | |
| Title | NGINX ngx_http_ssl_module vulnerability | |
| Weaknesses | CWE-908 | |
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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MITRE
Status: PUBLISHED
Assigner: f5
Published:
Updated: 2026-10-14T14:40:26.740Z
Reserved: 2026-09-30T17:31:09.133Z
Link: CVE-2026-97629
Vulnrichment
No data.
NVD
Status : Awaiting Analysis
Published: 2026-10-14T15:17:28.600
Modified: 2026-10-14T16:04:11.750
Link: CVE-2026-97629
Redhat
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OpenCVE Enrichment
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