CVEs / CVE-2026-97629
CVE-2026-97629: F5 NGINX Plus vulnerability
- high 8.3 CVSS 4.0 (from the CNA)
- EPSS 0.23% chance of exploitation in the next 30 days, higher than 13% of CVEs (30 Oct 2026)
- Last changed at its sources
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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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| F5 NGINX Plus | from 37.1.0, before 37.1.0.1 | 37.1.0.1 |
| F5 NGINX Plus | from 37.0.0, before 37.0.5.1 | 37.0.5.1 |
| F5 NGINX Plus | from R36 onwards | — |
| F5 NGINX Plus | from R35 onwards | — |
| F5 NGINX Plus | from R34 onwards | — |
| F5 NGINX Plus | from R33 onwards | — |
| F5 NGINX Open Source | from 1.31.0, before 1.31.7 | 1.31.7 |
| F5 NGINX Open Source | from 1.30.0, before 1.30.6 | 1.30.6 |
| F5 NGINX Open Source | from 1.23.3 onwards | — |
Exploitation
Not in the CISA Known Exploited Vulnerabilities catalog as of 30 Oct 2026.
Severity
| CVSS 4.0 | 8.3 highCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-908 |
On the Stackurity blog
References
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
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