A python-aiohttp security update has been released for Debian GNU/Linux 10 to address an open redirect vulnerability.

DSA 4864-1: python-aiohttp security update

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Debian Security Advisory DSA-4864-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 27, 2021   https://www.debian.org/security/faq
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Package : python-aiohttp
CVE ID : CVE-2021-21330

Beast Glatisant and Jelmer Vernooij reported that python-aiohttp, a
async HTTP client/server framework, is prone to an open redirect
vulnerability. A maliciously crafted link to an aiohttp-based web-server
could redirect the browser to a different website.

For the stable distribution (buster), this problem has been fixed in
version 3.5.1-1+deb10u1.

We recommend that you upgrade your python-aiohttp packages.

For the detailed security status of python-aiohttp please refer to its
security tracker page at:
  https://security-tracker.debian.org/tracker/python-aiohttp

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/