Vulnerability · Published Oct 14, 2026 · Assigned by f5
CVE-2026-97629NGINX ngx_http_ssl_module vulnerability
Medium 6.5
In plain English
A medium-severity security flaw in NGINX Open Source from F5. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.24 | nginx | 1.30.6-r0 | ALPINE-CVE-2026-97629 |
| Debian:12 | nginx | no fix listed | DEBIAN-CVE-2026-97629 |
| Debian:13 | nginx | 1.26.3-3+deb13u10 | DEBIAN-CVE-2026-97629 |
| Debian:14 | nginx | 1.30.4-8 | DEBIAN-CVE-2026-97629 |
| Ubuntu:22.04:LTS | nginx | 1.18.0-6ubuntu14.22 | USN-8955-1 |
| Ubuntu:24.04:LTS | nginx | 1.24.0-2ubuntu7.19 | UBUNTU-CVE-2026-97629 |
| Ubuntu:24.04:LTS | nginx | 1.24.0-2ubuntu7.19 | USN-8955-1 |
| Ubuntu:26.04:LTS | nginx | 1.28.3-2ubuntu1.12 | USN-8955-1 |
| Ubuntu:26.04:LTS | nginx | 1.28.3-2ubuntu1.12 | UBUNTU-CVE-2026-97629 |
| Ubuntu:26.10 | nginx | 1.30.4-7ubuntu1.1 | USN-8955-1 |
| Ubuntu:26.10 | nginx | 1.30.4-7ubuntu1.1 | UBUNTU-CVE-2026-97629 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| F5 | NGINX Plus | 37.1.0 – before 37.1.0.137.0.0 – before 37.0.5.1R36 – before *R35 – before *R34 – before *R33 – before * |
| F5 | NGINX Open Source | 1.31.0 – before 1.31.71.30.0 – before 1.30.61.23.3 – before * |
Weakness: CWE-908 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- https://my.f5.com/manage/s/article/K000162606 vendor-advisory