{"id":"DEBIAN-CVE-2026-56434","details":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process.  Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","modified":"2026-09-18T04:00:07.143086404Z","published":"2026-07-15T15:16:45.700Z","upstream":["CVE-2026-56434"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-56434"}],"affected":[{"package":{"name":"nginx","ecosystem":"Debian:12","purl":"pkg:deb/debian/nginx?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.22.1-9+deb12u10"}]}],"versions":["1.22.1-9","1.22.1-9+deb12u1","1.22.1-9+deb12u2","1.22.1-9+deb12u3","1.22.1-9+deb12u4","1.22.1-9+deb12u5","1.22.1-9+deb12u6","1.22.1-9+deb12u7","1.22.1-9+deb12u8","1.22.1-9+deb12u9"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56434.json"}},{"package":{"name":"nginx","ecosystem":"Debian:13","purl":"pkg:deb/debian/nginx?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.26.3-3+deb13u8"}]}],"versions":["1.26.3-3","1.26.3-3+deb13u1","1.26.3-3+deb13u2","1.26.3-3+deb13u3","1.26.3-3+deb13u4","1.26.3-3+deb13u5","1.26.3-3+deb13u6","1.26.3-3+deb13u7"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56434.json"}},{"package":{"name":"nginx","ecosystem":"Debian:14","purl":"pkg:deb/debian/nginx?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.30.1-7"}]}],"versions":["1.26.3-3","1.28.0-1","1.28.0-2","1.28.0-3","1.28.0-4","1.28.0-5","1.28.0-6","1.28.1-1","1.28.1-2","1.28.1-3","1.28.2-1","1.28.2-2","1.28.2-3","1.28.2-4","1.28.3-1","1.28.3-2","1.30.0-1","1.30.0-2","1.30.0-3","1.30.0-4","1.30.1-1","1.30.1-2","1.30.1-3","1.30.1-4","1.30.1-5","1.30.1-6"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-56434.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/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"}]}