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CVE details

CVE-2026-123817

AIOHTTP is an asynchronous HTTP client/server framework for asyncio and Python. Prior to 3.14.4, the WebSocket reader retains one bytes object for each transport read while reassembling an incomplete frame. A malicious peer can split a frame into many tiny reads so per-object overhead substantially exceeds the payload bytes allowed by max_msg_size. The condition affects a server receiving frames from a malicious client and a client receiving frames from a malicious server, and can cause excessive memory consumption or denial of service. This issue is fixed in version 3.14.4.

Score
8.7 high
Published
2026-11-09
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
www/py-aiohttppy312-aiohttp3.14.3unaddressedsunpoet@FreeBSD.org

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Check the version numbers before you commit this entry. Some ports share an entry in the CVE database with another port, such as sqlite2 and sqlite3. The version shown here may then be one that never existed for this port.

Ranges per package from the CVE rows that match this port, in pkg notation with the port's epoch and revision, every bound checked with pkg; one range per epoch the port actually had. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>py312-aiohttp -- FIXME</topic>
    <affects>
      <package>
	<name>py312-aiohttp</name>
	<range><lt>3.14.4</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>CVE-2026-123817: AIOHTTP is an asynchronous HTTP client/server
	  framework for asyncio and Python. Prior to 3.14.4, the WebSocket
	  reader retains one bytes object for each transport read while
	  reassembling an incomplete frame. A malicious peer can split a
	  frame into many tiny reads so per-object overhead substantially
	  exceeds the payload bytes allowed by max_msg_size. The condition
	  affects a server receiving frames from a malicious client and a
	  client receiving frames from a malicious server, and can cause
	  excessive memory consumption or denial of service. This issue is
	  fixed in version 3.14.4.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-123817</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-123817</url>
    </references>
    <dates>
      <discovery>2026-11-09</discovery>
      <entry>2026-11-10</entry>
    </dates>
  </vuln>