CVE-2026-54340

h2o is an HTTP server with support for HTTP/1.x, HTTP/2 and HTTP/3. Prior to commit 9265bdd, there is an HTTP/2 state amplification issue that combines HPACK decompression amplification with Slowloris-style stream stalling. Amplified decoded header state can be retained by stalled HTTP/2 streams,...

CVE-2026-48068

@grpc/grps-js implements the core functionality of gRPC purely in JavaScript, without a C++ addon. Prior to 1.9.16, 1.10.12, 1.11.4, 1.12.7, 1.13.5, and 1.14.4, an invalid incoming HTTP/2 stream initiation can cause a server process created using @grpc/grpc-js to crash. This issue is fixed in...

CVE-2026-55233 OpenResty: Buffer overflow when writing PROXY protocol v2 header to upstream

OpenResty is a high performance web platform. From 1.29.2.1 to before 1.29.2.5, an out-of-bounds write vulnerability exists in the upstream PROXY protocol v2 implementation. When OpenResty is configured to send PROXY protocol version 2 headers to upstream servers, constructing the header in the...

netty-codec-haproxy: Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from crafted PROXY protocol headers

A flaw was found in the Netty HAProxy PROXY protocol v2 codec. A remote attacker can exploit this vulnerability by sending a specially crafted HAProxy PROXY protocol v2 header with nested PP2TYPESSL type-length-value TLV records. This can lead to a memory leak, causing the underlying cumulation...

CVE-2026-13474

Denial of service via malformed HTTP/2 requests in NetScaler ADC and NetScaler Gateway if HTTP/2 is enabled in HTTP Profile and associated with the virtual server of type LB, CS, VPN or the service configured on NetScaler...

CVE-2026-13474

Denial of service via malformed HTTP/2 requests in NetScaler ADC and NetScaler Gateway if HTTP/2 is enabled in HTTP Profile and associated with the virtual server of type LB, CS, VPN or the service configured on NetScaler...

CVE-2026-13763

This CVE affects AWS Application Load Balancer (ALB) with AWS WAF enabled, where inconsistent interpretation of HTTP/2 requests can allow bypass of WAF body inspection when the request body is fragmented across frames, leading to partial inspection. Affected component: HTTP/2 ALB target groups; r...

PT-2026-53692

Name of the Vulnerable Software and Affected Versions AWS Application Load Balancer affected versions not specified Description Inconsistent interpretation of HTTP/2 requests in AWS Application Load Balancer when AWS WAF is enabled may allow remote actors to bypass managed rule body inspection. B...

PT-2026-52885

Name of the Vulnerable Software and Affected Versions Envoy versions 1.34.0 through 1.35.12 Envoy versions 1.36.0 through 1.36.8 Envoy versions 1.37.0 through 1.37.4 Envoy versions 1.38.0 through 1.38.2 Description The PROXY Protocol v2 header generator emits Type-Length-Values TLVs that exceed t...

GO-2026-5641 CrowdSec AppSec silently drops request body for chunked / HTTP-2 requests in github.com/crowdsecurity/crowdsec

CrowdSec AppSec silently drops request body for chunked / HTTP-2 requests in github.com/crowdsecurity/crowdsec...

Security update for terraform-provider-local, terraform-provider-null

This update for terraform-provider-local, terraform-provider-null fixes the following issue CVE-2026-33814: golang.org/x/net/http2: infinite loop in HTTP/2 transport when given bad SETTINGSMAXFRAMESIZE bsc1265658. Patch Instructions: To install this SUSE update use the SUSE recommended installati...

BIT-ENVOY-2026-47774 Envoy vulnerable to HTTP/2 memory exhaustion via cookie header size bypass and HPACK amplification

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1, a vulnerability in Envoy's HTTP/2 downstream request processing allows an unauthenticated remote client to trigger excessive memory consumption, potentiall...

SUSE-SU-2026:22195-1 Security update for tomcat

This update for tomcat fixes the following issues Update to Tomcat 9.0.118: - CVE-2026-41284: Unbounded read in WebDAV LOCK and PROPFIND handling bsc1265162. - CVE-2026-41293: HTTP/2 request headers not validated bsc1265163. - CVE-2026-42498: WebSocket authentication header exposure bsc1265165. -...

netty-codec-haproxy: Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from crafted PROXY protocol headers

A flaw was found in the Netty HAProxy PROXY protocol v2 codec. A remote attacker can exploit this vulnerability by sending a specially crafted HAProxy PROXY protocol v2 header with nested PP2TYPESSL type-length-value TLV records. This can lead to a memory leak, causing the underlying cumulation...

netty-codec-haproxy: Netty HAProxy PROXY protocol v2 codec: Denial of Service via memory leak from crafted PROXY protocol headers

A flaw was found in the Netty HAProxy PROXY protocol v2 codec. A remote attacker can exploit this vulnerability by sending a specially crafted HAProxy PROXY protocol v2 header with nested PP2TYPESSL type-length-value TLV records. This can lead to a memory leak, causing the underlying cumulation...

SUSE CVE-2026-48059

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, the HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nest...

CVE-2026-50560 Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty HTTP/2 max header size handling produces an attack similar to HTTP/2 Rapid Reset. There is a setting in the http2 specification called...

HTTP/2 Exposure Auditor

The script safely evaluates HTTP/2 exposure by negotiating ALPN, initiating a minimal HTTP/2 session, collecting server SETTINGS frames, and identifying potentially permissive protocol configurations. It avoids stream amplification, flooding behavior, connection fan-out, and sustained resource...

GHSA-H2QV-FJ59-J46J Netty HAProxy: Unbalanced Reference Count in Nested PP2_TYPE_SSL TLV Parsing Leads to Memory Exhaustion

Impact The HAProxy PROXY protocol v2 codec in netty leaks native or heap memory on every connection when a client sends a syntactically valid header containing nested PP2TYPESSL TLVs type-length-value records at depth two or greater. The leak occurs on the successful parse path — no exception is...

httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack

A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are th...