Vulnerability in F5 NGINX Plus

[ Description ]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.

[ Fixes ]Fixes and patches

• Security bulletin: F5 K000162613Vendor patch or bulletin · CERT-FR · my.f5.com/manage/s/article/K000162613, cited by CERT-FR CERTFR-2026-AVI-1317
• Security bulletin: F5 K000162606Vendor patch or bulletin · CERT-FR · my.f5.com/manage/s/article/K000162606, cited by CERT-FR CERTFR-2026-AVI-1317
• Security bulletin: F5 K000162416Vendor patch or bulletin · CERT-FR · my.f5.com/manage/s/article/K000162416, cited by CERT-FR CERTFR-2026-AVI-1317
• Security bulletin: F5 K000162607Vendor patch or bulletin · CERT-FR · my.f5.com/manage/s/article/K000162607, cited by CERT-FR CERTFR-2026-AVI-1317
• Security bulletin: F5 K000162608Vendor patch or bulletin · CERT-FR · my.f5.com/manage/s/article/K000162608, cited by CERT-FR CERTFR-2026-AVI-1317

[ Advisories ]Government CERT advisories

• CERT-FR19 Oct 2026CERTFR-2026-AVI-1341

  Multiple vulnerabilities in F5 products Translated from French

  Multiple vulnerabilities have been discovered in F5 products. Some of them allow an attacker to cause remote arbitrary code execution, remote denial of service and a breach of data confidentiality.

  CVE-2026-91184CVE-2026-101019CVE-2026-96615+8 more CVEs
• CERT-FR15 Oct 2026CERTFR-2026-AVI-1317

  Multiple vulnerabilities in F5 products Translated from French

  Multiple vulnerabilities have been discovered in F5 products. Some of them allow an attacker to cause remote arbitrary code execution, a breach of data confidentiality and a breach of data integrity.

  CVE-2026-15176CVE-2026-97205CVE-2026-95101+2 more CVEs
• BSI CERT-Bund14 Oct 2026WID-SEC-2026-3948

  NGINX: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-101025CVE-2026-15176CVE-2026-91184+8 more CVEs

[ References ]References

• my.f5.com/manage/s/article/K000162606