{"cve":{"cve_id":"CVE-2026-56434","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.0045,"epss_percentile":0.37367,"epss_as_of":"2026-08-26","description":"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.\n\nImpact:\nThis 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.\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","published_at":"2026-07-15T14:33:46.142000Z","last_modified_at":"2026-08-10T15:27:56.373000Z","cvss_v3_score":6.5,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":8.3,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","cvss_v4_severity":"HIGH","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-416"],"nvd_references":["https://my.f5.com/manage/s/article/K000162098"],"vuln_status":"Analyzed","trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-07-15T16:34:20.783547Z","updated_at":"2026-08-13T20:20:23.063882Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"H","value_label":"High"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"L","value_label":"Low"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":"4.0","metrics":[{"metric":"AV","name":"Attack Vector","value":"N","value_label":"Network"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"AT","name":"Attack Requirements","value":"P","value_label":"Present"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"VC","name":"Confidentiality (Vulnerable System)","value":"N","value_label":"None"},{"metric":"VI","name":"Integrity (Vulnerable System)","value":"L","value_label":"Low"},{"metric":"VA","name":"Availability (Vulnerable System)","value":"H","value_label":"High"},{"metric":"SC","name":"Confidentiality (Subsequent System)","value":"N","value_label":"None"},{"metric":"SI","name":"Integrity (Subsequent System)","value":"N","value_label":"None"},{"metric":"SA","name":"Availability (Subsequent System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"f5","vendor_name":"F5","product_slug":"nginx-gateway-fabric","product_name":"NGINX Gateway Fabric","version_start":"1.3.0","version_start_inclusive":true,"version_end":"1.6.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"nginx-ingress-controller","product_name":"NGINX Ingress Controller","version_start":"3.5.0","version_start_inclusive":true,"version_end":"3.7.2","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:continuous_releases:*:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"nginx-ingress-controller","product_name":"NGINX Ingress Controller","version_start":"2026-lts-r1","version_start_inclusive":true,"version_end":"2026-lts-r4","version_end_inclusive":false,"cpe23_uri":"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:long-term_support:*:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"nginx-ingress-controller","product_name":"NGINX Ingress Controller","version_start":"4.0.0","version_start_inclusive":true,"version_end":"4.0.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:nginx_ingress_controller:4.0.0:*:*:*:continuous_releases:*:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"nginx-ingress-controller","product_name":"NGINX Ingress 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