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Vulnerability details

CVE-2026-97629

F5 NGINX Open SourceF5 NGINX Plus

NGINX ngx_http_ssl_module vulnerability

CVSS 4.0
8.3High

Official 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

ScoreVersionSourceVector
8.3High 4.0 CVEProject cvelistV5 (CNA) (f5) 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
6.5Medium 3.1 CVEProject cvelistV5 (CNA) (f5) CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Affected products

VendorProductVersionsSource
F5 NGINX Open Source 1.23.3 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Open Source 1.30.0 ≤ v < 1.30.6 CVEProject cvelistV5 (CNA)
F5 NGINX Open Source 1.31.0 ≤ v < 1.31.7 CVEProject cvelistV5 (CNA)
F5 NGINX Plus 37.0.0 ≤ v < 37.0.5.1 CVEProject cvelistV5 (CNA)
F5 NGINX Plus 37.1.0 ≤ v < 37.1.0.1 CVEProject cvelistV5 (CNA)
F5 NGINX Plus R33 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R34 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R35 ≤ v CVEProject cvelistV5 (CNA)
F5 NGINX Plus R36 ≤ v CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-10-14
Last updated
2026-10-29
State
Published
Assigner (CNA)
f5

Exploit prediction (EPSS)

0.24%
Probability of exploitation in 30 days
15.9%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
None
Technical impact
Partial

Weaknesses (CWE)

  • CWE-908
    Use of Uninitialized Resource