cowboy: Cowboy: Denial of Service via HTTP/1.1 duplicate header names

A flaw was found in Cowboy. An unauthenticated remote attacker can exploit this vulnerability by sending multiple HTTP/1.1 header lines with the same name. This bypasses the maxheaders limit, causing the connection process memory to grow uncontrollably. This can lead to memory exhaustion and a...

CVE-2026-65624

A flaw was found in Cowboy. An unauthenticated remote attacker can exploit this vulnerability by sending multiple HTTP/1.1 header lines with the same name. This bypasses the maxheaders limit, causing the connection process memory to grow uncontrollably. This can lead to memory exhaustion and a...

EUVD-2026-49740

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1. The HTTP/1.1 handler in cowboyhttp enforces the maxheaders limit by counting the number of distinct header names in ...

CVE-2026-65624

The CVE affects the Cowboy HTTP/1.1 handler. The root cause is a per-request header handling flaw: when a request uses repeated header names, values are concatenated into a single binary under one map key, so the max_headers limit never increases and the total header block can grow without bound....

CVE-2026-65624

Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1. The HTTP/1.1 handler in cowboyhttp enforces the maxheaders limit by counting the number of distinct header names in ...

EEF-CVE-2026-65624 Cowboy HTTP/1.1 max_headers Bypass via Duplicate Header Names Enables Memory Exhaustion

Summary Allocation of Resources Without Limits or Throttling vulnerability in ninenines cowboy allows an unauthenticated remote attacker to exhaust connection process memory over HTTP/1.1. The HTTP/1.1 handler in cowboy\http enforces the max\headers limit by counting the number of distinct header...

UBUNTU-CVE-2024-37890

ws is an open source WebSocket client and server for Node.js. A request with a number of headers exceeding theserver.maxHeadersCount threshold could be used to crash a ws server. The vulnerability was fixed in [email protected] e55e510 and backported to [email protected] 22c2876, [email protected] eeb76d3, and [email protected]...

GHSA-3H5V-Q93C-6H6Q ws affected by a DoS when handling a request with many HTTP headers

Impact A request with a number of headers exceeding the server.maxHeadersCount threshold could be used to crash a ws server. Proof of concept js const http = require'http'; const WebSocket = require'ws'; const wss = new WebSocket.Server port: 0 , function const chars =...

dotnet: excess memory allocation via HttpClient causes DoS

A flaw was found in dotnet. The Microsoft Security Advisory describes the issue of the Apply MaxResponseHeadersLength limit for trailing headers to address a denial of service via excess memory allocations through the HttpClient...

dotnet: excess memory allocation via HttpClient causes DoS

A flaw was found in dotnet. The Microsoft Security Advisory describes the issue of the Apply MaxResponseHeadersLength limit for trailing headers to address a denial of service via excess memory allocations through the HttpClient...