CVE-2026-97629

MEDIUM 6.5

NGINX ngx_http_ssl_module vulnerability

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-908
Vendor	f5
Product	nginx plus
Published	Oct 14, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

F5 / NGINX Plus

37.1.0 < 37.1.0.1 37.0.0 < 37.0.5.1 R36 < * R35 < * R34 < * R33 < *

F5 / NGINX Open Source

1.31.0 < 1.31.7 1.30.0 < 1.30.6 1.23.3 < *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

my.f5.com: https://my.f5.com/manage/s/article/K000162606

Credits

F5 acknowledges PhiNode Labs for bringing this issue to our attention and following the highest standards of coordinated disclosure