aiohttp < 3.14.3 Out-of-bounds Read DoS

The version of aiohttp installed on the remote host is prior to 3.14.3. It is, therefore, affected by a denial of service vulnerability: - AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.3, an out-of-bounds heap read could occur in the C response pars...

PYSEC-2026-3545 AIOHTTP: Out-of-bounds heap read in C HTTP response parser error path (malformed chunked response)

Summary An out-of-bounds heap read could occur in the C response parser while building an error message for a malformed response. Impact An attacker controlled server, or possibly an accidental response could trigger a DoS in the client. Workaround If unable to upgrade, the Python parser is...

CVE-2026-54277 AIOHTTP: C HTTP Parser Bypasses max_line_size for Fragmented Lines

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.1, it is possible to bypass the maxlinesize check in parts of an HTTP request in the C parser. If using the optimised C parser the default in pre-built wheels, then an attacker may be able to send...

aiohttp: C HTTP Parser Bypasses max_line_size for Fragmented Lines

Summary It is possible to bypass the maxlinesize check in parts of an HTTP request in the C parser. Impact If using the optimised C parser the default in pre-built wheels, then an attacker may be able to send oversized lines through the HTTP parser and use an excessive amount of memory, potential...

aiohttp injection vulnerability

aiohttp is an open-source framework developed by aio-libs, used for asynchronous HTTP client/server interactions with asyncio and Python. Prior to version 3.13.4 of AIOHTTP, there was an injection vulnerability; this vulnerability stemmed from the C parser allowing empty bytes and control...