JLSEC-2026-624 HTTP/2 client HPACK desynchronization via header blocks for unknown streams in HTTP.jl

Description The HTTP/2 client's processincomingframe! dropped HEADERS/CONTINUATION frames for stream ids absent from conn.streams without passing the header block through the connection's HPACK decoder. Because HPACK's dynamic table is connection-scoped and mutated as a side effect of decoding ea...

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...

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...

CVE-2026-47774

CVE-2026-47774 affects Envoy prior to versions 1.35.11, 1.36.7, 1.37.3, and 1.38.1. A vulnerability in HTTP/2 downstream request processing combines two issues: (1) cookie header bytes are not fully accounted for during request header size validation, and (2) HPACK header limits are enforced on e...

CVE-2026-12043

A flaw was found in the AWS Common Runtime aws-c-http library. A remote attacker, by operating a malicious server, could send a crafted sequence of HTTP/2 HEADERS frames that improperly handle HPACK dynamic table size updates. This could lead to memory corruption on a connecting client applicatio...

📄 HTTP/2 Multi-Server HPACK Exhaustion

This code implements a multi-target HTTP/2 resource exhaustion framework designed to stress or overwhelm server implementations through protocol-level amplification techniques. It includes server-specific payload generation for multiple platforms, automated connection orchestration, stream scalin...

CVE-2026-10725

Protocol::HTTP2 for Perl (versions up to 1.12) is vulnerable to an HTTP/2 Bomb. The inbound HPACK path lacks a header-list size limit; headers_decode materialises a full key+value copy per indexed reference with no running size check, and stream_header_block_add appends every CONTINUATION frame u...

EUVD-2026-34964

Protocol::HTTP2 versions through 1.12 for Perl is vulnerable to a HTTP/2 Bomb. Protocol::HTTP2's inbound HPACK path has no header-list size limit, so a small HTTP/2 request can expand into large server memory the "HTTP/2 bomb". The headersdecode method materialises a full key+value copy per index...

OESA-2026-2568 wireshark security update

Wireshark allows you to examine protocol data stored in files or as it is captured from wired or wireless WiFi or Bluetooth networks, USB devices, and many other sources. It supports dozens of protocol capture file formats and understands more than a thousand protocols. Security Fixes: ROHC...

CVE-2026-40898 quic-go: HTTP/3 QPACK Trailer Expansion Memory Exhaustion

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field...

CVE-2026-40898

CVE-2026-40898 affects quic-go (Go QUIC implementation) prior to version 0.59.1. An attacker can cause memory exhaustion by sending a QPACK-encoded HEADERS frame that decodes into a large trailer section with many unique field names or large values, leading to excessive memory allocation when bui...

CVE-2026-40898

quic-go is an implementation of the QUIC protocol in Go. Prior to version 0.59.1, an attacker can cause excessive memory allocation in quic-go's HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame that decodes into a large trailer field section with many unique field...

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...

h2o -- HTTP/2 state amplification denial of service

h2o project reports: An HTTP/2 attack can combine HPACK decompression state amplification with stalled streams. Depending on server configuration, decoded header state can be retained by stalled streams, causing excessive memory use and denial of service...

New HTTP/2 Bomb Vulnerability Allows Remote DoS on NGINX, Apache, IIS, Envoy & Cloudflare

Cybersecurity researchers have discovered a remote denial-of-service exploit that affects major web servers, including NGINX, Apache HTTPD, Microsoft IIS, Envoy, and Cloudflare Pingora. The vulnerability has been codenamed HTTP/2 Bomb by Calif. "The vulnerable behavior exists in each server's...

PT-2026-46115

Name of the Vulnerable Software and Affected Versions quic-go affected versions not specified Description An attacker can trigger excessive memory allocation in the HTTP/3 client and server implementations by sending a QPACK-encoded HEADERS frame. This frame decodes into a large trailer field...

CVE-2026-9759

A flaw was found in the ROHC dissector in Wireshark. This issue occurs when malformed packets are decoded from a pcap file or the network, causing a NULL pointer dereference, resulting in a denial of service. Mitigation If the ROHC protocol dissector is not being used, it can be disabled via the...

OESA-2026-2481 wireshark security update

Wireshark allows you to examine protocol data stored in files or as it is captured from wired or wireless WiFi or Bluetooth networks, USB devices, and many other sources. It supports dozens of protocol capture file formats and understands more than a thousand protocols. Security Fixes: ROHC...

SUSE CVE-2026-9759

ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service...

UBUNTU-CVE-2026-9759

ROHC protocol dissector crash in Wireshark 4.6.0 to 4.6.5 and 4.4.0 to 4.4.15 allows denial of service...