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CRITICAL severity

Django-Anymail prone to a timing attackGHSA-hxf9-7h4c-f5jv

CRITICALFix: anymail/django-anymail@c079983

GHSA-hxf9-7h4c-f5jv is a critical-severity (CVSS 9.1) Information Exposure vulnerability in django-anymail. A fix is available for django-anymail — see the affected versions and patch details below.

Also known asCVE-2018-6596PYSEC-2018-7
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk
0.00%1.10%2.19%3.29%0.6%2.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐍django-anymail

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐍PyPIdjango-anymailall versions1.2.1pip install --upgrade 'django-anymail==1.2.1'

Affected Products

2 products · 2 configurations
OS
debian linuxdebian
1 version
9.0
Application
django-anymaildjango-anymail_project
< 1.2.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for django-anymail, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update django-anymail to 1.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-hxf9-7h4c-f5jv is resolved across your whole dependency graph.

  3. Workarounds

    Assume what was exposed is already known: rotate any credential, token or key that the affected component could return, restrict the endpoint to callers that genuinely need it, and strip sensitive fields from responses and error output at the boundary rather than relying on the client not to read them.

Frequently Asked Questions

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.
O3 Security · Impact-Aware SCA

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Django-Anymail prone to a timing attack (Critical 9.1)