{"attribution":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","cve":{"id":"CVE-2026-42926","sourceIdentifier":"f5sirt@f5.com","published":"2026-05-13T16:16:49.640","lastModified":"2026-10-26T14:10:00.130","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."},{"lang":"es","value":"Cuando NGINX Open Source está configurado para actuar como proxy de tráfico HTTP/2 al establecer proxy_http_version a 2, y también utiliza proxy_set_body, un atacante podría ser capaz de inyectar encabezados de trama y bytes de carga útil al par ascendente. Nota: Las versiones de software que han alcanzado el Fin del Soporte Técnico (EoTS) no se evalúan."}],"affected":[{"source":"f5sirt@f5.com","affectedData":[{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unaffected","modules":["ngx_http_proxy_v2_module"],"versions":[{"version":"1.31.0","lessThan":"*","versionType":"semver","status":"unaffected"},{"version":"1.29.4","lessThan":"1.30.1","versionType":"semver","status":"affected"}]}]}],"metrics":{"cvssMetricV40":[{"source":"f5sirt@f5.com","type":"Secondary","cvssData":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","baseScore":6.3,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","confidentialityRequirement":"NOT_DEFINED","integrityRequirement":"NOT_DEFINED","availabilityRequirement":"NOT_DEFINED","modifiedAttackVector":"NOT_DEFINED","modifiedAttackComplexity":"NOT_DEFINED","modifiedAttackRequirements":"NOT_DEFINED","modifiedPrivilegesRequired":"NOT_DEFINED","modifiedUserInteraction":"NOT_DEFINED","modifiedVulnConfidentialityImpact":"NOT_DEFINED","modifiedVulnIntegrityImpact":"NOT_DEFINED","modifiedVulnAvailabilityImpact":"NOT_DEFINED","modifiedSubConfidentialityImpact":"NOT_DEFINED","modifiedSubIntegrityImpact":"NOT_DEFINED","modifiedSubAvailabilityImpact":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED"}}],"cvssMetricV31":[{"source":"f5sirt@f5.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N","baseScore":5.8,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":1.4}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-05-13T15:54:52.773305Z","id":"CVE-2026-42926","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"f5sirt@f5.com","type":"Secondary","description":[{"lang":"en","value":"CWE-172"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*","versionStartIncluding":"1.3.0","versionEndIncluding":"1.6.2","matchCriteriaId":"15B7F1FD-0C49-460F-9CB8-23DA730EC4BE"},{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*","versionStartIncluding":"1.29.4","versionEndIncluding":"1.30.0","matchCriteriaId":"B99F7F00-2660-4609-A231-8F7E53A105A0"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*","versionStartIncluding":"2.0.0","versionEndIncluding":"2.6.0","matchCriteriaId":"0A6AA23F-A7A1-43DE-AD67-0EB1249143A4"},{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*","versionStartIncluding":"2.16.0","versionEndIncluding":"2.22.0","matchCriteriaId":"CBC31553-99DE-4155-A8E5-13A84FCCB610"}]}]},{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*","versionStartIncluding":"3.5.0","versionEndIncluding":"3.7.2","matchCriteriaId":"10D5B143-4C1E-4626-8B49-3EA7160E9256"},{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*","versionStartIncluding":"4.0.0","versionEndIncluding":"4.0.1","matchCriteriaId":"73A1CDBB-49F6-4AB6-AA67-542FD8017D6A"},{"vulnerable":true,"criteria":"cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0.0","versionEndIncluding":"5.4.2","matchCriteriaId":"607EEFA3-BE2A-4660-8C67-E6FC9799325F"}]}]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000161131","source":"f5sirt@f5.com","tags":["Mitigation","Vendor Advisory"]}]}}