CVE-2025-57804

CVE-2025-57804 affects the Python package h2 (HTTP/2 protocol stack). Prior to version 4.3.0, it allows HTTP/2 request splitting via CRLF injection in headers when servers downgrade HTTP/2 requests to HTTP/1.1 without validating header names/values. This can enable attackers to manipulate request...

CVE-2025-57804 h2 allows HTTP Request Smuggling due to illegal characters in headers

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without...

CVE-2025-57804 h2 allows HTTP Request Smuggling due to illegal characters in headers

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without...

CVE-2025-57804

h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without...

GHSA-63CX-G855-HVV4 mitmproxy binaries embed a vulnerable python-hyper/h2 dependency

mitmproxy 12.1.1 and below embed python-hyper/h2 ≤ v4.2.0, which has a gap in its HTTP/2 header validation. This enables request smuggling attacks when mitmproxy is in a configuration where it translates HTTP/2 to HTTP/1. For example, this affects reverse proxies to http:// backends. It does not...

mitmproxy binaries embed a vulnerable python-hyper/h2 dependency

mitmproxy 12.1.1 and below embed python-hyper/h2 ≤ v4.2.0, which has a gap in its HTTP/2 header validation. This enables request smuggling attacks when mitmproxy is in a configuration where it translates HTTP/2 to HTTP/1. For example, this affects reverse proxies to http:// backends. It does not...

GHSA-847F-9342-265H h2 allows HTTP Request Smuggling due to illegal characters in headers

Summary HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request...

h2 allows HTTP Request Smuggling due to illegal characters in headers

Summary HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when servers downgrade HTTP/2 requests to HTTP/1.1 without properly validating header names/values, enabling attackers to manipulate request...

Linux Distros Unpatched Vulnerability : CVE-2017-12165

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request...

Linux Distros Unpatched Vulnerability : CVE-2016-2086

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Node.js 0.10.x before 0.10.42, 0.12.x before 0.12.10, 4.x before 4.3.0, and 5.x before 5.6.0 allow remote attackers to conduct HTTP request smuggling attacks vi...

python-hyper h2 注入漏洞

python-hyper h2 is a Python HTTP/2 protocol implementation of Hyper open source. An injection vulnerability exists in python-hyper h2 versions prior to 4.3.0, which stems from HTTP2 request splitting and could lead to a request smuggling attack...

Linux Distros Unpatched Vulnerability : CVE-2018-21245

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Pound before 2.8 allows HTTP request smuggling, a related issue to CVE-2016-10711. CVE-2018-21245 Note that Nessus relies on the presence of the package as...

Linux Distros Unpatched Vulnerability : CVE-2016-15039

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - A vulnerability classified as critical was found in mhuertos phpLDAPadmin up to 665dbc2690ebeb5392d38f1fece0a654225a0b38. Affected by this vulnerability is the...

PT-2025-34706

Name of the Vulnerable Software and Affected Versions: h2 versions prior to 4.3.0 Description: h2 is a pure-Python implementation of a HTTP/2 protocol stack. A request splitting issue allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs when...

Ubuntu: Security Advisory (USN-7709-1)

The remote host is missing an update for the SPDX-FileCopyrightText: 2025 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...

Smuggling Requests with Chunked Extensions: A New HTTP Desync Trick

A new HTTP request smuggling technique was recently discovered, where attackers take advantage of inconsistent parsing behaviors between front-end proxy servers and back-end application servers. This attack technique leverages ambiguous request formatting to inject malicious secondary requests th...

USN-7709-1: WEBrick vulnerability

It was discovered that WEBrick incorrectly parsed HTTP headers. In configurations where WEBrick is placed behind an HTTP proxy, a remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack...

USN-7709-1 ruby-webrick vulnerability

It was discovered that WEBrick incorrectly parsed HTTP headers. In configurations where WEBrick is placed behind an HTTP proxy, a remote attacker could possibly use this issue to perform an HTTP Request Smuggling attack...

ROS-20250821-01

WSGI server gunicorn vulnerability is related to flaws in HTTP request handling. Exploitation of the vulnerability could allow an attacker acting remotely to bypass the existing security restrictions and execute an HTTP request smuggling attack...

Linux Distros Unpatched Vulnerability : CVE-2025-53643

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.12.14, the Python parser is vulnerable to a request smuggling...