Vulnerability Details CVE-2026-42530
NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free 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 0.032
EPSS Ranking 86.7%
CVSS Severity
CVSS v3 Score 8.1
References
Products affected by CVE-2026-42530
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cpe:2.3:a:f5:nginx_gateway_fabric:1.3.0
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cpe:2.3:a:f5:nginx_gateway_fabric:1.4.0
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cpe:2.3:a:f5:nginx_gateway_fabric:1.5.0
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cpe:2.3:a:f5:nginx_gateway_fabric:1.5.1
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cpe:2.3:a:f5:nginx_gateway_fabric:1.6.0
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cpe:2.3:a:f5:nginx_gateway_fabric:1.6.1
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cpe:2.3:a:f5:nginx_gateway_fabric:1.6.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.0.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.0.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.0.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.1.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.1.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.1.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.1.3
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cpe:2.3:a:f5:nginx_gateway_fabric:2.1.4
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cpe:2.3:a:f5:nginx_gateway_fabric:2.2.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.2.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.2.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.3.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.4.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.4.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.4.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.5.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.5.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.6.0
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cpe:2.3:a:f5:nginx_gateway_fabric:2.6.1
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cpe:2.3:a:f5:nginx_gateway_fabric:2.6.2
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cpe:2.3:a:f5:nginx_gateway_fabric:2.6.3
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cpe:2.3:a:f5:nginx_ingress_controller:3.5.0
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cpe:2.3:a:f5:nginx_ingress_controller:3.5.1
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cpe:2.3:a:f5:nginx_ingress_controller:3.5.2
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cpe:2.3:a:f5:nginx_ingress_controller:3.6.0
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cpe:2.3:a:f5:nginx_ingress_controller:3.6.1
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cpe:2.3:a:f5:nginx_ingress_controller:3.6.2
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cpe:2.3:a:f5:nginx_ingress_controller:3.7.0
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cpe:2.3:a:f5:nginx_ingress_controller:3.7.1
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cpe:2.3:a:f5:nginx_ingress_controller:3.7.2
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cpe:2.3:a:f5:nginx_ingress_controller:4.0.0
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cpe:2.3:a:f5:nginx_ingress_controller:4.0.1
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cpe:2.3:a:f5:nginx_ingress_controller:5.0.0
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cpe:2.3:a:f5:nginx_ingress_controller:5.3.0
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cpe:2.3:a:f5:nginx_ingress_controller:5.3.2
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cpe:2.3:a:f5:nginx_ingress_controller:5.3.3
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cpe:2.3:a:f5:nginx_ingress_controller:5.3.4
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cpe:2.3:a:f5:nginx_ingress_controller:5.4.0
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cpe:2.3:a:f5:nginx_ingress_controller:5.4.1
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cpe:2.3:a:f5:nginx_ingress_controller:5.4.2
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cpe:2.3:a:f5:nginx_ingress_controller:5.4.3
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cpe:2.3:a:f5:nginx_ingress_controller:5.5.0
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cpe:2.3:a:f5:nginx_instance_manager:2.17.0
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cpe:2.3:a:f5:nginx_instance_manager:2.17.1
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cpe:2.3:a:f5:nginx_instance_manager:2.17.2
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cpe:2.3:a:f5:nginx_instance_manager:2.17.3
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cpe:2.3:a:f5:nginx_instance_manager:2.17.4
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cpe:2.3:a:f5:nginx_instance_manager:2.18.0
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cpe:2.3:a:f5:nginx_instance_manager:2.19.0
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cpe:2.3:a:f5:nginx_instance_manager:2.19.1
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cpe:2.3:a:f5:nginx_instance_manager:2.21.0
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cpe:2.3:a:f5:nginx_instance_manager:2.22.0
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cpe:2.3:a:f5:nginx_open_source:1.31.0
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cpe:2.3:a:f5:nginx_open_source:1.31.1