PYSEC-2026-1098 aiohttp vulnerable to Denial of Service when trying to parse malformed POST requests

Summary An attacker can send a specially crafted POST multipart/form-data request. When the aiohttp server processes it, the server will enter an infinite loop and be unable to process any further requests. Impact An attacker can stop the application from serving requests after sending a single...

Python Library aiohttp < 3.14.1 Multiple Vulnerabilities

The version of the aiohttp Python library installed on the remote host is prior to 3.14.1. It is, therefore, affected by multiple vulnerabilities: - Prior to 3.14.1, no limit was present on the number of pipelined requests that could be queued. An attacker may be able to use pipelined requests to...

Python Library aiohttp < 3.14.0 Header Injection

The version of the aiohttp Python library installed on the remote host is prior to 3.14.0. It is, therefore, affected by a vulnerability: - Prior to 3.14.0, attacker-controlled input included into multipart/payload headers can be used to modify a request to inject additional headers or similar. I...

CVE-2026-50269

A flaw was found in aiohttp, an asynchronous HTTP client/server framework. This vulnerability, known as CRLF Carriage Return Line Feed injection, allows an attacker to modify HTTP requests by injecting malicious input into multipart or payload headers. If an application processes user-controlled...

GHSA-M9GH-VJ53-GVH9 python-engineio has possible denial of service due to maximum payload size sometimes not being enforced

Impact There are two specific configurations of the python-engineio server in which the size of incoming messages is not checked before the messages are loaded into memory. An attacker can take advantage of these to cause unnecessary memory allocations in the python-engineio server. The two cases...

PT-2026-53020

Name of the Vulnerable Software and Affected Versions python-engineio versions prior to 4.13.2 Description Two specific configurations of the server fail to verify the size of incoming messages before loading them into memory, which can lead to excessive memory allocations. This occurs during POS...

SUSE SLES16 Security Update : python-aiohttp (SUSE-SU-2026:22173-1)

The remote SUSE Linux SLES16 / SLESSAP16 host has a package installed that is affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:22173-1 advisory. This update for python-aiohttp fixes the following issues - CVE-2026-22815: insufficient header/trailer handling can cause a denia...

Moderate: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

An update for Red Hat Hardened Images RPMs is now available. This update includes the following RPMs: python-sentry-sdk: python3-sentry-sdk+aiohttp-2.48.0-6.hum1 noarch python3-sentry-sdk+asyncpg-2.48.0-6.hum1 noarch python3-sentry-sdk+bottle-2.48.0-6.hum1 noarch...

CVE-2026-54273

A flaw was found in AIOHTTP, an asynchronous HTTP client/server framework for asyncio and Python. An attacker could exploit this vulnerability by sending an unlimited number of pipelined requests, causing the system to consume excessive amounts of memory. This could lead to a Denial of Service Do...

CVE-2026-54274

A flaw was found in aiohttp, an asynchronous HTTP client/server framework. An attacker can exploit this vulnerability by sending large, incomplete websocket frame payloads. This can bypass normal memory usage limits, potentially leading to a Denial of Service DoS where the affected system becomes...

CVE-2026-54275

A flaw was found in aiohttp, an asynchronous HTTP client/server framework. This vulnerability allows a remote attacker to bypass the Transport Layer Security TLS Server Name Indication SNI check. This occurs when an application reuses an existing connection for multiple requests to the same domai...

CVE-2026-54277

A flaw was found in aiohttp, an asynchronous HTTP client/server framework for Python. A remote attacker can exploit this vulnerability by sending oversized lines within an HTTP request. This bypasses the maxlinesize check in the C parser, causing the system to use an excessive amount of memory...

CVE-2026-54278

A flaw was found in aiohttp, an asynchronous HTTP client/server framework. An attacker could send a specially crafted compressed request body that, during cleanup, would be decompressed into memory in one large chunk. This could potentially lead to a Denial of Service DoS condition, where the...

CVE-2026-54279

A flaw was found in aiohttp before 3.14.1. Host-only cookies saved with CookieJar.save and later restored with CookieJar.load lose their host-only flag, so cookies intended for a single host may be sent to subdomains after persistence...

python311-aiohttp-3.14.1-1.1 on GA media (moderate)

python311-aiohttp-3.14.1-1.1 on GA media Announcement ID: openSUSE-SU-2026:11097-1 Rating: moderate Cross-References: CVE-2026-50269 CVE-2026-54273 CVE-2026-54275 CVE-2026-54277 CVE-2026-54279 CVSS scores: CVE-2026-50269 SUSE : 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N CVE-2026-54273 SUSE ...

ROS-20260624-73-0044

The vulnerability in python-aiohttp is related to the failure to handle CR LF sequences in HTTP headers. Exploiting this vulnerability allows a remote attacker to inject arbitrary HTTP headers...

ROS-20260624-73-0042

The vulnerability in python-aiohttp is related to uncontrolled resource consumption. Exploiting this vulnerability can allow a remote attacker to cause service interruptions...

ROS-20260624-73-0046

The vulnerability in python-aiohttp is related to unlimited resource distribution. Exploiting this vulnerability can allow a remote attacker to cause service interruptions...

ROS-20260624-73-0047

The vulnerability in python-aiohttp is related to the failure to handle CR LF sequences in HTTP headers. Exploiting this vulnerability allows a remote attacker to inject arbitrary HTTP headers...

CVE-2026-54276

A flaw was found in aiohttp, an asynchronous HTTP client/server framework for asyncio and Python. The DigestAuthMiddleware component can send an authentication response after following a cross-origin redirect. This could allow a remote attacker, in conjunction with an open redirect vulnerability ...