CVE-2026-58055 - nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

CVE-2026-58055 - nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

https://cvefeed.io/rssfeed/latest.atom / Sun, 06/28/2026 - 07:02
CVE ID :CVE-2026-58055
Published : June 28, 2026, 1:32 a.m. | 3 hours, 9 minutes ago
Description :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.
Severity: 6.3 | MEDIUM
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