CVE-2026-97629
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NGINX SSL Session Ticket Key Forgery Vulnerability
Vulnerability report for CVE-2026-97629, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-10-14
Last updated on: 2026-10-14
Assigner: F5 Networks
Description
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.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| F5 | NGINX | Plus 37.1.0 |
| F5 | NGINX | Plus 37.0.0 |
| F5 | NGINX | Plus R36 |
| F5 | NGINX | Plus R35 |
| F5 | NGINX | Plus R34 |
| F5 | NGINX | Plus R33 |
| F5 | NGINX | Open Source 1.31.0 |
| F5 | NGINX | Open Source 1.30.0 |
| F5 | NGINX | Open Source 1.23.3 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-908 | The product uses or accesses a resource that has not been initialized. |
