{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-1642","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","state":"PUBLISHED","assignerShortName":"f5","dateReserved":"2026-01-29T18:26:26.996Z","datePublished":"2026-02-04T15:02:06.154Z","dateUpdated":"2026-02-05T05:25:39.303Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unknown","product":"NGINX Open Source","vendor":"F5","versions":[{"changes":[{"at":"1.28.2","status":"unaffected"}],"lessThan":"1.29.5","status":"affected","version":"1.3.0","versionType":"semver"}]},{"defaultStatus":"unknown","product":"NGINX Plus","vendor":"F5","versions":[{"lessThan":"R36 P2","status":"affected","version":"R36","versionType":"custom"},{"lessThan":"R35 P1","status":"affected","version":"R35","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R34","versionType":"custom"},{"lessThan":"*","status":"affected","version":"R33","versionType":"custom"},{"lessThan":"R32 P4","status":"affected","version":"R32","versionType":"custom"}]}],"credits":[{"lang":"en","type":"finder","value":"F5"}],"datePublic":"2026-02-04T15:00:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<span style=\"background-color: rgb(255, 255, 255);\">\n\n<span style=\"background-color: rgb(255, 255, 255);\">\n\n<span style=\"background-color: rgb(255, 255, 255);\">A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server.&nbsp;&nbsp;</span></span>Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.\n\n</span><br>"}],"value":"A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","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":8.2,"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:N/VI:H/VA:N/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-349","description":"CWE-349: Acceptance of Extraneous Untrusted Data With Trusted Data","lang":"en","type":"CWE"}]}],"providerMetadata":{"orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","shortName":"f5","dateUpdated":"2026-02-04T15:02:06.154Z"},"references":[{"tags":["vendor-advisory"],"url":"https://my.f5.com/manage/s/article/K000159824"}],"source":{"discovery":"INTERNAL"},"title":"NGINX vulnerability","x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-04T16:01:47.913148Z","id":"CVE-2026-1642","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":"2026-02-04T16:02:24.781Z"}},{"title":"CVE Program Container","references":[{"url":"http://www.openwall.com/lists/oss-security/2026/02/05/1"}],"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2026-02-05T05:25:39.303Z"}}]}}