CVE-2026-97629: CWE-908 Use of Uninitialized Resource in F5 NGINX Plus
Description
CVE-2026-97629 is a vulnerability in F5 NGINX Plus and NGINX Open Source related to the use of uninitialized resources when configured with ssl_session_cache without explicit ssl_session_ticket_key directives. This flaw allows a remote unauthenticated attacker to forge client SSL sessions unpredictably, potentially bypassing client certificate verification. The issue affects the data plane only and does not expose the control plane. The vulnerability has a medium severity with a CVSS score of 6.5.
CVSS v3.1
Score 6.5medium
Affected software
F5
NGINX Plus
F5
NGINX Open Source
pkg:github/nginx/nginxpkg:github/nginx/nginx-plusRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
When NGINX Plus or NGINX Open Source is configured with ssl_session_cache shared:name:size but lacks explicit ssl_session_ticket_key file directives for automatic rotation of SSL session ticket keys, a remote unauthenticated attacker can forge client SSL sessions in a non-deterministic manner beyond their control. This can lead to bypassing verification of client certificates. The vulnerability is categorized as CWE-908 (Use of Uninitialized Resource) and affects multiple versions of NGINX Plus and Open Source as specified.
Potential Impact
The vulnerability can allow attackers to bypass client certificate verification by forging SSL sessions, potentially exposing resources or functionality to unauthorized actors. This may lead to unauthorized access to sensitive information. The issue affects only the data plane and does not impact the control plane.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, ensure that ssl_session_ticket_key file directives are explicitly configured to enable automatic rotation of SSL session ticket keys to mitigate the risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- f5
- Date Reserved
- 2026-09-30T17:31:09.133Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6acf96722cdf04f6568bcee1
Added to database: 10/14/2026, 14:49:22 UTC
Last enriched: 10/14/2026, 15:03:47 UTC
Last updated: 10/14/2026, 15:08:10 UTC
Views: 5
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