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Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-42055

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.028

EPSS Ranking 84.9%

CVSS Severity

CVSS v3 Score 8.1

References

Products affected by CVE-2026-42055

F5 » Dos » Version: 4.9.0

cpe:2.3:a:f5:dos:4.9.0
F5 » Nginx App Protect Dos » Version: Any

cpe:2.3:a:f5:nginx_app_protect_dos:*
F5 » Nginx App Protect Waf » Version: Any

cpe:2.3:a:f5:nginx_app_protect_waf:*
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 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 Instance Manager » Version: 2.17.0

cpe:2.3:a:f5:nginx_instance_manager:2.17.0
F5 » Nginx Instance Manager » Version: 2.17.1

cpe:2.3:a:f5:nginx_instance_manager:2.17.1
F5 » Nginx Instance Manager » Version: 2.17.2

cpe:2.3:a:f5:nginx_instance_manager:2.17.2
F5 » Nginx Instance Manager » Version: 2.17.3

cpe:2.3:a:f5:nginx_instance_manager:2.17.3
F5 » Nginx Instance Manager » Version: 2.17.4

cpe:2.3:a:f5:nginx_instance_manager:2.17.4
F5 » Nginx Instance Manager » Version: 2.18.0

cpe:2.3:a:f5:nginx_instance_manager:2.18.0
F5 » Nginx Instance Manager » Version: 2.19.0

cpe:2.3:a:f5:nginx_instance_manager:2.19.0
F5 » Nginx Instance Manager » Version: 2.19.1

cpe:2.3:a:f5:nginx_instance_manager:2.19.1
F5 » Nginx Instance Manager » Version: 2.21.0

cpe:2.3:a:f5:nginx_instance_manager:2.21.0
F5 » Nginx Instance Manager » Version: 2.22.0

cpe:2.3:a:f5:nginx_instance_manager:2.22.0
F5 » Nginx Open Source » Version: 1.30.0

cpe:2.3:a:f5:nginx_open_source:1.30.0
F5 » Nginx Open Source » Version: 1.30.1

cpe:2.3:a:f5:nginx_open_source:1.30.1
F5 » Nginx Open Source » Version: 1.30.2

cpe:2.3:a:f5:nginx_open_source:1.30.2
F5 » Nginx Open Source » Version: 1.31.1

cpe:2.3:a:f5:nginx_open_source:1.31.1
F5 » Nginx Plus » Version: Any

cpe:2.3:a:f5:nginx_plus:*
F5 » Nginx Plus » Version: r3

cpe:2.3:a:f5:nginx_plus:r3
F5 » Nginx Plus » Version: r30

cpe:2.3:a:f5:nginx_plus:r30
F5 » Nginx Plus » Version: r31

cpe:2.3:a:f5:nginx_plus:r31
F5 » Nginx Plus » Version: r32

cpe:2.3:a:f5:nginx_plus:r32
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: 4.8.1

cpe:2.3:a:f5:waf:4.8.1
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: 5.9.0

cpe:2.3:a:f5:waf:5.9.0

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-42055

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