{"cve":{"cve_id":"CVE-2026-42945","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":0.68047,"epss_percentile":0.99267,"epss_as_of":"2026-08-26","description":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap 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.","published_at":"2026-05-13T14:12:43.971000Z","last_modified_at":"2026-08-25T13:19:03.373000Z","cvss_v3_score":8.1,"cvss_v3_vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":9.2,"cvss_v4_vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","cvss_v4_severity":"CRITICAL","ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-122","CWE-131"],"nvd_references":["https://my.f5.com/manage/s/article/K000161019"],"vuln_status":"Modified","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":"2026-06-24T00:09:39.878444Z","updated_at":"2026-08-25T19:35:50.379874Z"},"effective_severity":"CRITICAL","badges":["epss"],"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":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"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":"H","value_label":"High"},{"metric":"AT","name":"Attack Requirements","value":"N","value_label":"None"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User 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System)","value":"N","value_label":"None"}]},"affected":[{"vendor_slug":"f5","vendor_name":"F5","product_slug":"dos","product_name":"dos","version_start":"4.3.0","version_start_inclusive":true,"version_end":"4.7.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:dos:*:*:*:*:*:nginx:*:*"},{"vendor_slug":"f5","vendor_name":"F5","product_slug":"dos","product_name":"dos","version_start":"4.8.0","version_start_inclusive":true,"version_end":"4.8.0","version_end_inclusive":true,"cpe23_uri":"cpe:2.3:a:f5:dos:4.8.0:*:*:*:*:nginx:*:*"},{"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 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