PT-2026-45787

Summary Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client HTTP/2 CONTINUATION flood. When Mint's HTTP/2 receive path observes a HEADERS frame without the END HEADERS flag, the unparse...

PT-2026-45785

Summary Allocation of Resources Without Limits or Throttling vulnerability in elixir-mint Mint allows attacker-controlled HTTP/2 servers to exhaust memory in a Mint client via PUSH PROMISE flooding. In lib/mint/http2.ex, Mint.HTTP2.decode push promise headers and add response/5 inserts a :reserve...

CVE-2025-12105 Libsoup: heap use-after-free in libsoup message queue handling during http/2 read completion

A flaw was found in the asynchronous message queue handling of the libsoup library, widely used by GNOME and WebKit-based applications to manage HTTP/2 communications. When network operations are aborted at specific timing intervals, an internal message queue item may be freed twice due to missin...

Updated varnish & lighttpd packages fix security vulnerability

It was discovered that a denial of service attack can be performed on cache servers that have the HTTP/2 protocol turned on. An attacker can create a large number of streams and immediately reset them without ever reaching the maximum number of concurrent streams allowed for the session, causing...

CVE-2025-54479 BIG-IP PEM vulnerability

When a classification profile is configured on a virtual server without an HTTP or HTTP/2 profile, undisclosed requests can cause the Traffic Management Microkernel TMM to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

CVE-2025-55669 BIG-IP HTTP/2 vulnerability

When the BIG-IP Advanced WAF and ASM security policy and a server-side HTTP/2 profile are configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel TMM to terminate. Note: Software versions which have reached End of Technical Support EoTS are not evaluated...

OESA-2025-2167 lighttpd security update

Secure, fast, compliant and very flexible web-server which has been optimized for high-performance environments. It has a very low memory footprint compared to other webservers and takes care of cpu-load. Its advanced feature-set FastCGI, CGI, Auth, Output-Compression, URL-Rewriting and many more...

tomcat: Apache Tomcat denial of service

A denial of service flaw was found in Apache Tomcat. An uncontrolled resource consumption vulnerability, where an HTTP/2 client fails to acknowledge the initial settings frame that reduces the maximum permitted concurrent streams, could result in a denial of service...

CVE-2025-8671

A mismatch caused by client-triggered server-sent stream resets between HTTP/2 specifications and the internal architectures of some HTTP/2 implementations may result in excessive server resource consumption leading to denial-of-service DoS. By opening streams and then rapidly triggering the serv...

tomcat: Apache Tomcat: DoS via malformed HTTP/2 PRIORITY_UPDATE frame

A flaw was found in Apache Tomcat. This vulnerability allows an application-level denial of service DoS, causing it to become unresponsive or slow via maliciously crafted HTTP/2 prioritization headers. It performs an incomplete cleanup of failed requests, which triggers a memory leak...

nodejs: GOAWAY HTTP/2 frames cause memory leak outside heap

A vulnerability was found in NodeJS when handling HTTP/2 connections, where the remote peer abruptly closes the socket without sending the proper HTTP/2 notification to the server, leading to a memory leak. This flaw allows an attacker to force the targeted process in the targeted host to an...

mod_http2: DoS by null pointer in websocket over HTTP/2

A flaw was found in the Apache HTTP Server. Serving WebSocket protocol upgrades over an HTTP/2 connection could result in a NULL pointer dereference, leading to a crash of the server process...

Mozilla: Denial of Service using HTTP/2 CONTINUATION frames

The Mozilla Foundation Security Advisory describes this flaw as: There was no limit to the number of HTTP/2 CONTINUATION frames that would be processed. A server could abuse this to create an Out of Memory condition in the browser...

golang: net/http, x/net/http2: rapid stream resets can cause excessive work (CVE-2023-44487)

A flaw was found in handling multiplexed streams in the HTTP/2 protocol. A client can repeatedly make a request for a new multiplex stream and immediately send an RSTSTREAM frame to cancel it. This creates extra work for the server setting up and tearing down the streams while not hitting any...

PT-2024-2770 · Envoy +1 · Envoy +1

Name of the Vulnerable Software and Affected Versions: Envoy versions prior to 1.26.7 Envoy versions prior to 1.27.3 Envoy versions prior to 1.28.1 Envoy versions prior to 1.29.1 Description: The issue is related to pointer dereference errors in the Envoy proxy server. Exploitation of this issue...

HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack)

A flaw was found in handling multiplexed streams in the HTTP/2 protocol. A client can repeatedly make a request for a new multiplex stream and immediately send an RSTSTREAM frame to cancel it. This creates extra work for the server setting up and tearing down the streams while not hitting any...

HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack)

A flaw was found in handling multiplexed streams in the HTTP/2 protocol. A client can repeatedly make a request for a new multiplex stream and immediately send an RSTSTREAM frame to cancel it. This creates extra work for the server setting up and tearing down the streams while not hitting any...

CLSA-2023-1698690146 nginx: Fix of CVE-2023-44487

CVE-2023-44487: HTTP/2 - per-iteration stream handling limit...

Microsoft Response to Distributed Denial of Service (DDoS) Attacks against HTTP/2

Summary Beginning in September 2023, Microsoft was notified by industry partners about a newly identified Distributed Denial-of-Service DDoS attack technique being used in the wild targeting HTTP/2 protocol. This vulnerability CVE-2023-44487 impacts any internet exposed HTTP/2 endpoints. As an...

undertow: Server identity in https connection is not checked by the undertow client

A flaw was found in undertow. The undertow client is not checking the server identity the server certificate presents in HTTPS connections. This is a compulsory step that should at least be performed by default in HTTPS and in http/2...