CVE-2026-69218 Http4s Ember HTTP/2: unbounded continuation frame accumulation

Http4s is a Scala interface for HTTP services. Prior to 0.23.35 and 1.0.0-M47, When Ember receives an HTTP/2 HEADERS or PUSHPROMISE frame without ENDHEADERS, H2Connection buffers the header block and subsequent CONTINUATION fragments without a size bound. A remote peer can keep an incomplete bloc...

CVE-2026-69218

Http4s Ember HTTP/2 is vulnerable to unbounded continuation frame accumulation in its H2Connection component. When Ember receives an HTTP/2 HEADERS or PUSH_PROMISE frame without END_HEADERS, it buffers the header block and subsequent CONTINUATION fragments without a size bound . A remote peer can...

Envoy-CPU-Exhaustion-Vulnerability-PoC

Envoy CPU Exhaustion Vulnerability PoC This repository contains a proof-of-concept PoC Python script to demonstrate the CPU exhaustion vulnerability in Envoy caused by a flood of CONTINUATION frames. Author: blackmagic 2024 Description Envoy is a cloud-native, open-source edge and service proxy...

net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame

A flaw was found in the HTTP/2 protocol implementation within the Go standard library golang.org/x/net and net/http/internal/http2. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGSMAXFRAMESIZE parameter set to zero. This...

Astra Linux – Vulnerability in nghttp2

nghttp2 is an implementation of the Hypertext Transfer Protocol Version 2 in C. The nghttp2 library prior to version 1.61.0 continued to read an unlimited number of HTTP/2 CONTINUATION frames even after a stream was reset, in order to keep the HPACK context synchronized. This caused excessive CPU...

undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames

A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client process. The primary consequence is memory exhaustion,...

undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames

A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client process. The primary consequence is memory exhaustion,...

net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame

A flaw was found in the HTTP/2 protocol implementation within the Go standard library golang.org/x/net and net/http/internal/http2. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGSMAXFRAMESIZE parameter set to zero. This...

net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame

A flaw was found in the HTTP/2 protocol implementation within the Go standard library golang.org/x/net and net/http/internal/http2. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGSMAXFRAMESIZE parameter set to zero. This...

net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame

A flaw was found in the HTTP/2 protocol implementation within the Go standard library golang.org/x/net and net/http/internal/http2. A remote attacker can exploit this vulnerability by sending a specially crafted HTTP/2 SETTINGS frame with the SETTINGSMAXFRAMESIZE parameter set to zero. This...

Astra Linux – Vulnerability in golang-golang-x-net, golang-1.19

An attacker may cause an HTTP/2 endpoint to read arbitrary amounts of header data by sending an excessive number of CONTINUATION frames. Maintaining HPACK state requires parsing and processing all HEADERS and CONTINUATION frames on a connection. When a request’s headers exceed MaxHeaderBytes, no...

Astra Linux – Vulnerability in Netty

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, a remote user could trigger a Denial of Service DoS attack on a Netty HTTP/2 server by sending a flood of CONTINUATION frames. The server lacks a limit on the number of...

Astra Linux – Vulnerability in Firefox, Thunderbird

There was no limit to the number of HTTP/2 CONTINUATION frames that could be processed. A server could exploit this to cause a memory exhaustion condition in the browser. This vulnerability affects Firefox 125, Firefox ESR 115.10, and Thunderbird 115.10...

Security Bulletin: IBM Storage Protect Server is affected by a vulnerability in the netty-codec-http library that could allow remote attacker to send a large number of specially crafted frames, causing excessive CPU consumption (CVE-2026-33871).

Summary IBM Storage Protect Server uses the netty-codec-http library in certain components. A vulnerability in netty could allow remote attacker to send a large number of specially crafted CONTINUATION frames, causing excessive CPU consumption and rendering the server unresponsive. The issue aris...

CVE-2026-59248 Unbounded HPACK/QPACK prefixed-integer decoding in Cowlib causes memory-exhaustion DoS

Allocation of resources without limits vulnerability in ninenines cowlib allows an unauthenticated remote HTTP/2 or HTTP/3 peer to exhaust memory on the vulnerable server or client and cause a denial of service. The HPACK and QPACK prefixed-integer decoder cowhpackcommon:decbigint/3 in...

CVE-2026-65623

Inefficient Algorithmic Complexity vulnerability in mtrudel bandit allows unauthenticated remote denial of service via CPU exhaustion during WebSocket fragment reassembly. The size guard 'Elixir.Bandit.WebSocket.Connection':oversizemessage?/2 called from handleframe/3 in...

undici: undici: Denial of Service due to unbounded memory growth via WebSocket frames

A flaw was found in undici. A malicious WebSocket server can exploit this by streaming numerous small or empty continuation frames. This can bypass per-frame and cumulative-size validation, leading to unbounded memory growth in the client process. The primary consequence is memory exhaustion,...

CVE-2026-59246

The CVE concerns elixir-mint mint: an unbounded chain of zero-length HTTP/2 CONTINUATION frames can bypass the header-block size cap in Mint.HTTP2.handle_continuation/3, causing unbounded memory growth on the client and eventual out-of-memory termination. The vulnerability arises because each CON...

EEF-CVE-2026-59246 Zero-length HTTP/2 CONTINUATION frames bypass Mint's header-block byte-size cap and exhaust client memory

Summary Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP2.handle\continuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by ea...

EUVD-2026-43643

Allocation of resources without limits vulnerability in elixir-mint mint allows a remote HTTP/2 server to exhaust memory on the client host and cause a denial of service. The Mint.HTTP2.handlecontinuation/3 function in lib/mint/http2.ex accumulates the header-block fragment carried by each HTTP/2...