{"id":"UBUNTU-CVE-2026-1642","details":"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.","modified":"2026-02-13T18:29:30.973776Z","published":"2026-02-04T15:16:00Z","related":["USN-8038-1"],"upstream":["CVE-2026-1642"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-1642"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-1642"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2026/02/05/1"},{"type":"REPORT","url":"https://my.f5.com/manage/s/article/K000159824"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8038-1"}],"affected":[{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.4.6-1ubuntu3.9+esm5?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.1-3ubuntu1","1.4.3-2ubuntu1","1.4.4-1ubuntu1","1.4.4-2ubuntu1","1.4.4-4ubuntu1","1.4.5-1ubuntu1","1.4.6-1ubuntu2","1.4.6-1ubuntu3","1.4.6-1ubuntu3.1","1.4.6-1ubuntu3.2","1.4.6-1ubuntu3.3","1.4.6-1ubuntu3.4","1.4.6-1ubuntu3.5","1.4.6-1ubuntu3.6","1.4.6-1ubuntu3.7","1.4.6-1ubuntu3.8","1.4.6-1ubuntu3.9","1.4.6-1ubuntu3.9+esm1","1.4.6-1ubuntu3.9+esm2","1.4.6-1ubuntu3.9+esm3","1.4.6-1ubuntu3.9+esm4","1.4.6-1ubuntu3.9+esm5"],"ecosystem_specific":{"binaries":[{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-common"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-core"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-extras"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-full"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-light"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-naxsi"},{"binary_version":"1.4.6-1ubuntu3.9+esm5","binary_name":"nginx-naxsi-ui"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1642.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.10.3-0ubuntu0.16.04.5+esm6?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.9.3-1ubuntu1","1.9.6-2ubuntu1","1.9.6-2ubuntu2","1.9.9-0ubuntu1","1.9.9-1ubuntu1","1.9.10-0ubuntu1","1.9.10-1ubuntu1","1.9.11-0ubuntu1","1.9.11-0ubuntu2","1.9.12-0ubuntu1","1.9.13-0ubuntu1","1.9.14-0ubuntu1","1.9.15-0ubuntu1","1.10.0-0ubuntu0.16.04.1","1.10.0-0ubuntu0.16.04.2","1.10.0-0ubuntu0.16.04.3","1.10.0-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.1","1.10.3-0ubuntu0.16.04.2","1.10.3-0ubuntu0.16.04.3","1.10.3-0ubuntu0.16.04.4","1.10.3-0ubuntu0.16.04.5","1.10.3-0ubuntu0.16.04.5+esm1","1.10.3-0ubuntu0.16.04.5+esm2","1.10.3-0ubuntu0.16.04.5+esm3","1.10.3-0ubuntu0.16.04.5+esm4","1.10.3-0ubuntu0.16.04.5+esm5","1.10.3-0ubuntu0.16.04.5+esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx-common"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx-core"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx-extras"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx-full"},{"binary_version":"1.10.3-0ubuntu0.16.04.5+esm6","binary_name":"nginx-light"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-1642.json"}},{"package":{"name":"nginx","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/nginx@1.14.0-0ubuntu1.11+esm1?arch=source&distro=esm-infra/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.12.1-0ubuntu2","1.13.6-2ubuntu1","1.13.6-2ubuntu2","1.13.10-1ubuntu1","1.13.12-0ubuntu1","1.14.0-0ubuntu1","1.14.0-0ubuntu1.1","1.14.0-0ubuntu1.2","1.14.0-0ubuntu1.3","1.14.0-0ubuntu1.4","1.14.0-0ubuntu1.5","1.14.0-0ubuntu1.6","1.14.0-0ubuntu1.7","1.14.0-0ubuntu1.9","1.14.0-0ubuntu1.10","1.14.0-0ubuntu1.11","1.14.0-0ubuntu1.11+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-auth-pam"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-cache-purge"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-dav-ext"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-echo"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-fancyindex"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-geoip"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-headers-more-filter"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-image-filter"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-lua"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libnginx-mod-http-ndk"},{"binary_version":"1.14.0-0ubuntu1.11+esm1","binary_name":"libngi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