CVE-2018-6596: webhooks/base.py in Anymail (aka django-anymail) before 1.2.1 is prone to a timing attack vulnerability on the

Q: How do I fix CVE-2018-6596?

django-anymail: upgrade to 1.2.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2018-6596 being exploited?

CVE-2018-6596 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2018-6596 affect?

CVE-2018-6596 affects django-anymail, debian linux. Severity is critical (CVSS 9.1). 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.

Q: How urgent is CVE-2018-6596?

Priority 63/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

This week

CRITICAL 9.1REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2018-6596 is a critical-severity flaw (CVSS 9.1) affecting django-anymail, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-200
Published	2018-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · django-anymail project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-02-03 21:29 UTCPublished CVE record published
2026-06-17 02:02 UTCUpdated Record last modified

django-anymail project django-anymail UPGRADE

Affected: < 1.2.1

Fixed in: 1.2.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy django-anymail || rpm -q django-anymail || django-anymail --version

2. UPGRADE to 1.2.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade django-anymail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade django-anymail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

debian debian linux MITIGATE

Affected: 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2018-6596?

django-anymail: upgrade to 1.2.1; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-6596 being exploited?

CVE-2018-6596 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2018-6596 affect?

CVE-2018-6596 affects django-anymail, debian linux. Severity is critical (CVSS 9.1). 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.

How urgent is CVE-2018-6596?

Priority 63/100. Critical severity; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Django vulnerabilities · Debian vulnerabilities

Related CVEs

CVE-2018-1000089 HIGH 7.4 UPGRADE Anymail django-anymail version version 0.2 through 1.3 contains a CWE-532, CWE-209 vulnerability in WEBHOOK_AU

References

← Back to latest CVEs