{"id":"DEBIAN-CVE-2026-58055","details":"nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.","modified":"2026-09-01T16:06:52.356102276Z","published":"2026-06-28T02:16:32.677Z","upstream":["CVE-2026-58055"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-58055"}],"affected":[{"package":{"name":"nghttp2","ecosystem":"Debian:12","purl":"pkg:deb/debian/nghttp2?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.52.0-1","1.52.0-1+deb12u1","1.52.0-1+deb12u2","1.52.0-1+deb12u3","1.53.0-1","1.54.0-1","1.55.1-1","1.56.0-1","1.57.0-1","1.58.0-1","1.59.0-1","1.60.0-1","1.61.0-1","1.62.1-1","1.62.1-2","1.63.0-1","1.64.0-1","1.64.0-1.1","1.68.0-1","1.68.0-2","1.68.1-1","1.69.0-1","1.70.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58055.json"}},{"package":{"name":"nghttp2","ecosystem":"Debian:13","purl":"pkg:deb/debian/nghttp2?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.64.0-1.1","1.64.0-1.1+deb13u1","1.68.0-1","1.68.0-2","1.68.1-1","1.69.0-1","1.70.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58055.json"}},{"package":{"name":"nghttp2","ecosystem":"Debian:14","purl":"pkg:deb/debian/nghttp2?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.70.0-1"}]}],"versions":["1.64.0-1.1","1.68.0-1","1.68.0-2","1.68.1-1","1.69.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-58055.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/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"}]}