A c-ares security update has been released for Arch Linux.

ASA-202011-18: c-ares: denial of service

Arch Linux Security Advisory ASA-202011-18
=========================================
Severity: Medium
Date : 2020-11-19
CVE-ID : CVE-2020-8277
Package : c-ares
Type : denial of service
Remote : Yes
Link :   https://security.archlinux.org/AVG-1280

Summary
======
The package c-ares before version 1.17.1-1 is vulnerable to denial of
service.

Resolution
=========
Upgrade to 1.17.1-1.

# pacman -Syu "c-ares>=1.17.1-1"

The problem has been fixed upstream in version 1.17.1.

Workaround
=========
None.

Description
==========
An application that allows an attacker to trigger a DNS request for a
host of their choice could trigger a Denial of Service by getting the
application to resolve a DNS record with a large number of responses.

Impact
=====
A remote malicious attacker might be able to crash the application with
a crafted DNS response.

References
=========
  https://github.com/c-ares/c-ares/issues/371
  https://github.com/c-ares/c-ares/commit/0d252eb3b2147179296a3bdb4ef97883c97c54d3
  https://security.archlinux.org/CVE-2020-8277