{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42946","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","state":"PUBLISHED","assignerShortName":"f5","dateReserved":"2026-04-30T23:04:27.965Z","datePublished":"2026-05-13T14:12:44.697Z","dateUpdated":"2026-05-13T16:06:56.898Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unknown","modules":["ngx_http_scgi_module and ngx_http_uwsgi_module"],"product":"NGINX Plus","vendor":"F5","versions":[{"lessThan":"*","status":"unaffected","version":"R37","versionType":"custom"},{"lessThan":"R36 P4","status":"affected","version":"R36","versionType":"custom"},{"lessThan":"R32 P6","status":"affected","version":"R32","versionType":"custom"}]},{"defaultStatus":"unaffected","modules":["ngx_http_scgi_module and ngx_http_uwsgi_module"],"product":"NGINX Open Source","vendor":"F5","versions":[{"lessThan":"*","status":"unaffected","version":"1.31.0","versionType":"semver"},{"lessThan":"1.30.1","status":"affected","version":"0.8.42","versionType":"semver"}]}],"credits":[{"lang":"en","type":"finder","value":"F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure."}],"datePublic":"2026-05-13T14:00:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgb(255, 255, 255);\">A vulnerability exists in the </span><strong>ngx_http_scgi_module</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;and </span><strong>ngx_http_uwsgi_module</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;modules that may result in excessive memory allocation or an over-read of data. When </span><strong>scgi_pass</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;or </span><strong>uwsgi_pass</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.</span>&nbsp; Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}],"value":"A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":8.3,"baseSeverity":"HIGH","privilegesRequired":"NONE","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-789","description":"CWE-789: Memory Allocation with Excessive Size Value","lang":"en","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-823","description":"CWE-823: Use of Out-of-range Pointer Offset","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","shortName":"f5","dateUpdated":"2026-05-13T14:12:44.697Z"},"references":[{"tags":["vendor-advisory","patch"],"url":"https://my.f5.com/manage/s/article/K000161027"}],"source":{"discovery":"EXTERNAL"},"title":"NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability","x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T15:55:04.864917Z","id":"CVE-2026-42946","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-05-13T16:06:56.898Z"}}]}}