CVE-2018-6596 Django-Anymail prone to a timing attack

What is CVE-2018-6596?

CVE-2018-6596 is a critical vulnerability in Debian Debian Linux, published on 3 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

webhooks/base.py in Anymail (aka django-anymail) before 1.2.1 is prone to a timing attack vulnerability on the WEBHOOK_AUTHORIZATION secret, which allows remote attackers to post arbitrary e-mail tracking events.

Weakness: CWE-200

Which versions are affected by CVE-2018-6596?

3 open source packages ship an affected version, including django-anymail. It affects 2 products.

Products include Debian Debian Linux, Django-Anymail Project Django-Anymail.

How do I fix CVE-2018-6596?

Upgrade django-anymail to 1.2.1 or later.

Is CVE-2018-6596 being exploited?

There is no known exploitation of CVE-2018-6596 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2018-6596, DSA-4107-1, GHSA-hxf9-7h4c-f5jv, PYSEC-2018-7.