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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-56434

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process. Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. 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.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.004

EPSS Ranking 37.4%

CVSS Severity

CVSS v3 Score 6.5

References

https://my.f5.com/manage/s/article/K000162098

Products affected by CVE-2026-56434

F5 » Nginx Gateway Fabric » Version: 1.3.0

cpe:2.3:a:f5:nginx_gateway_fabric:1.3.0
F5 » Nginx Gateway Fabric » Version: 1.4.0

cpe:2.3:a:f5:nginx_gateway_fabric:1.4.0
F5 » Nginx Gateway Fabric » Version: 1.5.0

cpe:2.3:a:f5:nginx_gateway_fabric:1.5.0
F5 » Nginx Gateway Fabric » Version: 1.5.1

cpe:2.3:a:f5:nginx_gateway_fabric:1.5.1
F5 » Nginx Gateway Fabric » Version: 1.6.0

cpe:2.3:a:f5:nginx_gateway_fabric:1.6.0
F5 » Nginx Gateway Fabric » Version: 1.6.1

cpe:2.3:a:f5:nginx_gateway_fabric:1.6.1
F5 » Nginx Gateway Fabric » Version: 1.6.2

cpe:2.3:a:f5:nginx_gateway_fabric:1.6.2
F5 » Nginx Gateway Fabric » Version: 2.0.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.0.0
F5 » Nginx Gateway Fabric » Version: 2.0.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.0.1
F5 » Nginx Gateway Fabric » Version: 2.0.2

cpe:2.3:a:f5:nginx_gateway_fabric:2.0.2
F5 » Nginx Gateway Fabric » Version: 2.1.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.1.0
F5 » Nginx Gateway Fabric » Version: 2.1.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.1.1
F5 » Nginx Gateway Fabric » Version: 2.1.2

cpe:2.3:a:f5:nginx_gateway_fabric:2.1.2
F5 » Nginx Gateway Fabric » Version: 2.1.3

cpe:2.3:a:f5:nginx_gateway_fabric:2.1.3
F5 » Nginx Gateway Fabric » Version: 2.1.4

cpe:2.3:a:f5:nginx_gateway_fabric:2.1.4
F5 » Nginx Gateway Fabric » Version: 2.2.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.2.0
F5 » Nginx Gateway Fabric » Version: 2.2.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.2.1
F5 » Nginx Gateway Fabric » Version: 2.2.2

cpe:2.3:a:f5:nginx_gateway_fabric:2.2.2
F5 » Nginx Gateway Fabric » Version: 2.3.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.3.0
F5 » Nginx Gateway Fabric » Version: 2.4.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.4.0
F5 » Nginx Gateway Fabric » Version: 2.4.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.4.1
F5 » Nginx Gateway Fabric » Version: 2.4.2

cpe:2.3:a:f5:nginx_gateway_fabric:2.4.2
F5 » Nginx Gateway Fabric » Version: 2.5.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.5.0
F5 » Nginx Gateway Fabric » Version: 2.5.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.5.1
F5 » Nginx Gateway Fabric » Version: 2.6.0

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.0
F5 » Nginx Gateway Fabric » Version: 2.6.1

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.1
F5 » Nginx Gateway Fabric » Version: 2.6.2

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.2
F5 » Nginx Gateway Fabric » Version: 2.6.3

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.3
F5 » Nginx Gateway Fabric » Version: 2.6.4

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.4
F5 » Nginx Gateway Fabric » Version: 2.6.5

cpe:2.3:a:f5:nginx_gateway_fabric:2.6.5
F5 » Nginx Ingress Controller » Version: 2026-lts-r1

cpe:2.3:a:f5:nginx_ingress_controller:2026-lts-r1
F5 » Nginx Ingress Controller » Version: 2026-lts-r2

cpe:2.3:a:f5:nginx_ingress_controller:2026-lts-r2
F5 » Nginx Ingress Controller » Version: 2026-lts-r3

cpe:2.3:a:f5:nginx_ingress_controller:2026-lts-r3
F5 » Nginx Ingress Controller » Version: 3.5.0

cpe:2.3:a:f5:nginx_ingress_controller:3.5.0
F5 » Nginx Ingress Controller » Version: 3.5.1

cpe:2.3:a:f5:nginx_ingress_controller:3.5.1
F5 » Nginx Ingress Controller » Version: 3.5.2

cpe:2.3:a:f5:nginx_ingress_controller:3.5.2
F5 » Nginx Ingress Controller » Version: 3.6.0

cpe:2.3:a:f5:nginx_ingress_controller:3.6.0
F5 » Nginx Ingress Controller » Version: 3.6.1

cpe:2.3:a:f5:nginx_ingress_controller:3.6.1
F5 » Nginx Ingress Controller » Version: 3.6.2

cpe:2.3:a:f5:nginx_ingress_controller:3.6.2
F5 » Nginx Ingress Controller » Version: 3.7.0

cpe:2.3:a:f5:nginx_ingress_controller:3.7.0
F5 » Nginx Ingress Controller » Version: 3.7.1

cpe:2.3:a:f5:nginx_ingress_controller:3.7.1
F5 » Nginx Ingress Controller » Version: 3.7.2

cpe:2.3:a:f5:nginx_ingress_controller:3.7.2
F5 » Nginx Ingress Controller » Version: 4.0.0

cpe:2.3:a:f5:nginx_ingress_controller:4.0.0
F5 » Nginx Ingress Controller » Version: 4.0.1

cpe:2.3:a:f5:nginx_ingress_controller:4.0.1
F5 » Nginx Ingress Controller » Version: 5.0.0

cpe:2.3:a:f5:nginx_ingress_controller:5.0.0
F5 » Nginx Ingress Controller » Version: 5.3.0

cpe:2.3:a:f5:nginx_ingress_controller:5.3.0
F5 » Nginx Ingress Controller » Version: 5.3.2

cpe:2.3:a:f5:nginx_ingress_controller:5.3.2
F5 » Nginx Ingress Controller » Version: 5.3.3

cpe:2.3:a:f5:nginx_ingress_controller:5.3.3
F5 » Nginx Ingress Controller » Version: 5.3.4

cpe:2.3:a:f5:nginx_ingress_controller:5.3.4
F5 » Nginx Ingress Controller » Version: 5.4.0

cpe:2.3:a:f5:nginx_ingress_controller:5.4.0
F5 » Nginx Ingress Controller » Version: 5.4.1

cpe:2.3:a:f5:nginx_ingress_controller:5.4.1
F5 » Nginx Ingress Controller » Version: 5.4.2

cpe:2.3:a:f5:nginx_ingress_controller:5.4.2
F5 » Nginx Ingress Controller » Version: 5.4.3

cpe:2.3:a:f5:nginx_ingress_controller:5.4.3
F5 » Nginx Ingress Controller » Version: 5.5.0

cpe:2.3:a:f5:nginx_ingress_controller:5.5.0
F5 » Nginx Ingress Controller » Version: 5.5.1

cpe:2.3:a:f5:nginx_ingress_controller:5.5.1
F5 » Nginx Ingress Controller » Version: 5.5.2

cpe:2.3:a:f5:nginx_ingress_controller:5.5.2
F5 » Nginx Plus » Version: 37.0.0.1

cpe:2.3:a:f5:nginx_plus:37.0.0.1
F5 » Nginx Plus » Version: 37.0.1.1

cpe:2.3:a:f5:nginx_plus:37.0.1.1
F5 » Nginx Plus » Version: 37.0.2.1

cpe:2.3:a:f5:nginx_plus:37.0.2.1
F5 » Nginx Plus » Version: r33

cpe:2.3:a:f5:nginx_plus:r33
F5 » Nginx Plus » Version: r34

cpe:2.3:a:f5:nginx_plus:r34
F5 » Nginx Plus » Version: r35

cpe:2.3:a:f5:nginx_plus:r35
F5 » Nginx Plus » Version: r36

cpe:2.3:a:f5:nginx_plus:r36
F5 » Waf » Version: 4.11.0

cpe:2.3:a:f5:waf:4.11.0
F5 » Waf » Version: 4.12.0

cpe:2.3:a:f5:waf:4.12.0
F5 » Waf » Version: 4.13.0

cpe:2.3:a:f5:waf:4.13.0
F5 » Waf » Version: 4.14.0

cpe:2.3:a:f5:waf:4.14.0
F5 » Waf » Version: 4.15.0

cpe:2.3:a:f5:waf:4.15.0
F5 » Waf » Version: 4.16.0

cpe:2.3:a:f5:waf:4.16.0
F5 » Waf » Version: 5.10.0

cpe:2.3:a:f5:waf:5.10.0
F5 » Waf » Version: 5.11.0

cpe:2.3:a:f5:waf:5.11.0
F5 » Waf » Version: 5.11.1

cpe:2.3:a:f5:waf:5.11.1
F5 » Waf » Version: 5.12.0

cpe:2.3:a:f5:waf:5.12.0
F5 » Waf » Version: 5.12.1

cpe:2.3:a:f5:waf:5.12.1
F5 » Waf » Version: 5.13.0

cpe:2.3:a:f5:waf:5.13.0
F5 » Waf » Version: 5.13.1

cpe:2.3:a:f5:waf:5.13.1
F5 » Waf » Version: 5.13.2

cpe:2.3:a:f5:waf:5.13.2
F5 » Waf » Version: 5.13.3

cpe:2.3:a:f5:waf:5.13.3
F5 » Waf » Version: 5.2.0

cpe:2.3:a:f5:waf:5.2.0
F5 » Waf » Version: 5.3.0

cpe:2.3:a:f5:waf:5.3.0
F5 » Waf » Version: 5.4.0

cpe:2.3:a:f5:waf:5.4.0
F5 » Waf » Version: 5.5.0

cpe:2.3:a:f5:waf:5.5.0
F5 » Waf » Version: 5.6.0

cpe:2.3:a:f5:waf:5.6.0
F5 » Waf » Version: 5.7.0

cpe:2.3:a:f5:waf:5.7.0
F5 » Waf » Version: 5.8.0

cpe:2.3:a:f5:waf:5.8.0
F5 » Waf » Version: 5.9.0

cpe:2.3:a:f5:waf:5.9.0

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-56434

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