CVE-2026-58055

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...

EUVD-2026-39975

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...

CVE-2026-58055

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...

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

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...

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

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...

CVE-2026-43974

Unexpected Status Code or Return Value vulnerability in ninenines gun gunhttp module allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response. In gunhttp:handleinform/8, when a 101 Switching Protocols response is received over...

CVE-2026-43974 gun HTTP/1.1 client accepts unsolicited 101 Switching Protocols response allowing server-driven protocol hijack and OOM

Unexpected Status Code or Return Value vulnerability in ninenines gun gunhttp module allows a malicious HTTP server to force the client into raw protocol mode via an unsolicited 101 Switching Protocols response. In gunhttp:handleinform/8, when a 101 Switching Protocols response is received over...

PT-2026-47300

Name of the Vulnerable Software and Affected Versions gun versions 2.0.0 through 2.3.x Description An issue in the gun http module allows a malicious HTTP server to force a client into raw protocol mode by sending an unsolicited 101 Switching Protocols response. In the handle inform/8 function, t...

PT-2026-53087

Name of the Vulnerable Software and Affected Versions nghttp2 nghttpx versions prior to 1.69.0 Description The nghttpx proxy forwards HTTP/1.1 Upgrade requests that contain a Content-Length header and body onto reusable keep-alive backend connections. During this process, it re-adds the Upgrade a...

Important: nodejs24

Issue Overview: Undici allows duplicate HTTP Content-Length headers when they are provided in an array with case-variant names e.g., Content-Length and content-length. This produces malformed HTTP/1.1 requests with multiple conflicting Content-Length values on the wire. Who is impacted:...

Linux Distros Unpatched Vulnerability : CVE-2026-1527

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - ImpactWhen an application passes user-controlled input to the upgrade option of client.request, an attacker can inject CRLF sequences \r\n to: Inject arbitrary...

DEBIAN-CVE-2026-1527

ImpactWhen an application passes user-controlled input to the upgrade option of client.request, an attacker can inject CRLF sequences \r\n to: Inject arbitrary HTTP headers Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services Redis, Memcached, Elasticsearch The...

CVE-2026-2833

An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the...

GHSA-XQ2H-P299-VJWV Pingora vulnerable to HTTP Request Smuggling via Premature Upgrade

Impact Pingora versions prior to 0.8.0 would immediately forward bytes following a request with an Upgrade header to the backend, without waiting for a 101 Switching Protocols response. This allows an attacker to smuggle requests to the backend and bypass proxy-level security controls. This...

Pingora vulnerable to HTTP Request Smuggling via Premature Upgrade

Impact Pingora versions prior to 0.8.0 would immediately forward bytes following a request with an Upgrade header to the backend, without waiting for a 101 Switching Protocols response. This allows an attacker to smuggle requests to the backend and bypass proxy-level security controls. This...

Duplicate Advisory: HTTP Request Smuggling via Premature Upgrade

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-xq2h-p299-vjwv. This link is maintained to preserve external references. Original Description An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The...

GHSA-F9V3-J2M7-4HPG Duplicate Advisory: HTTP Request Smuggling via Premature Upgrade

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-xq2h-p299-vjwv. This link is maintained to preserve external references. Original Description An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The...

CVE-2026-2833

An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the...

CVE-2026-2833: Inconsistent Interpretation of HTTP Requests

An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the...

CVE-2026-2833 HTTP Request Smuggling via Premature Upgrade

An HTTP request smuggling vulnerability CWE-444 was found in Pingora's handling of HTTP/1.1 connection upgrades. The issue occurs when a Pingora proxy reads a request containing an Upgrade header, causing the proxy to pass through the rest of the bytes on the connection to a backend before the...