Imperva Customers Protected Against CVE-2026-49975 (HTTP/2 Bomb) DoS

TL;DR: CVE-2026-49975, dubbed the “HTTP/2 Bomb,” is a critical remote Denial-of-Service DoS vulnerability affecting default HTTP/2 configurations of major web servers including NGINX, Apache HTTPD, Microsoft IIS, Envoy, and Cloudflare Pingora. Discovered by security firm Calif using OpenAI’s Code...

PT-2026-45945

Name of the Vulnerable Software and Affected Versions Apache HTTP Server versions 2.4.17 through 2.4.67 nginx affected versions not specified Description A memory allocation issue exists in the HTTP/2 implementation of several web servers, dubbed the HTTP/2 Bomb. In Apache HTTP Server, the mod ht...

CVE-2026-2835

An HTTP Request Smuggling vulnerability CWE-444 has been found in Pingora's parsing of HTTP/1.0 and Transfer-Encoding requests. The issue occurs due to improperly allowing HTTP/1.0 request bodies to be close-delimited and incorrect handling of multiple Transfer-Encoding values, allowing attackers...

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-2026-2836

A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction. The issue occurs because the default HTTP cache key implementation generates cache keys using only the URI path, excluding critical factors such as the host header authority...

EUVD-2026-9512

Pingora vulnerable to cache poisoning via insecure-by-default cache key...

GHSA-F93W-PCJ3-RGGC Pingora vulnerable to cache poisoning via insecure-by-default cache key

Impact Pingora versions prior to 0.8.0 generated cache keys using only the URI path, excluding critical factors such as the host header. This allows an attacker to poison the cache and serve cross-origin responses to users. This vulnerability affects users of Pingora's alpha proxy caching feature...

Pingora vulnerable to cache poisoning via insecure-by-default cache key

Impact Pingora versions prior to 0.8.0 generated cache keys using only the URI path, excluding critical factors such as the host header. This allows an attacker to poison the cache and serve cross-origin responses to users. This vulnerability affects users of Pingora's alpha proxy caching feature...

GHSA-HJ7X-879W-VRP7 Pingora has HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

Impact Pingora versions prior to 0.8.0 improperly allowed HTTP/1.0 request bodies to be close-delimited and incorrectly handled multiple Transfer-Encoding values. This allows an attacker to desync Pingora's request framing from backend servers and smuggle requests to the backend. This vulnerabili...

Pingora has HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

Impact Pingora versions prior to 0.8.0 improperly allowed HTTP/1.0 request bodies to be close-delimited and incorrectly handled multiple Transfer-Encoding values. This allows an attacker to desync Pingora's request framing from backend servers and smuggle requests to the backend. This vulnerabili...

EUVD-2026-9510

Pingora vulnerable to HTTP Request Smuggling via Premature Upgrade...

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...

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...

GHSA-2M8C-2374-465F Duplicate Advisory: Cache poisoning via insecure-by-default cache key

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-f93w-pcj3-rggc. This link is maintained to preserve external references. Original Description A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction...

GHSA-262P-VJX5-45XH Duplicate Advisory: HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-hj7x-879w-vrp7. This link is maintained to preserve external references. Original Description An HTTP Request Smuggling vulnerability CWE-444 has been found in Pingora's parsing of HTTP/1.0 and Transfer-Encoding...

Duplicate Advisory: HTTP Request Smuggling via HTTP/1.0 and Transfer-Encoding Misparsing

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-hj7x-879w-vrp7. This link is maintained to preserve external references. Original Description An HTTP Request Smuggling vulnerability CWE-444 has been found in Pingora's parsing of HTTP/1.0 and Transfer-Encoding...

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...

Duplicate Advisory: Cache poisoning via insecure-by-default cache key

Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-f93w-pcj3-rggc. This link is maintained to preserve external references. Original Description A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction...

CVE-2026-2836

A cache poisoning vulnerability has been found in the Pingora HTTP proxy framework’s default cache key construction. The issue occurs because the default HTTP cache key implementation generates cache keys using only the URI path, excluding critical factors such as the host header authority...