Incorrect signature verification in django-ses
The django_ses library implements a mail backend for Django using AWS Simple Email Service. The library exports the SESEventWebhookView class intended to receive signed requests from AWS to handle email bounces, subscriptions, etc. These requests are signed by AWS and are verified by django_ses, however the verification of this signature was found to be flawed as it allowed users to specify arbitrary public certificates.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | django-ses | < 3.5.0 | 3.5.0 |
References
- https://github.com/django-ses/django-ses/blob/3d627067935876487f9938310d5e1fbb249a7778/CVE/001-cert-url-signature-verification.md
- https://github.com/django-ses/django-ses/commit/b71b5f413293a13997b6e6314086cb9c22629795
- https://github.com/django-ses/django-ses/security/advisories/GHSA-qg36-9jxh-fj25
- https://nvd.nist.gov/vuln/detail/CVE-2023-33185
- https://github.com/django-ses/django-ses
- https://github.com/pypa/advisory-database/tree/main/vulns/django-ses/PYSEC-2023-82.yaml
- CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L- Weakness (CWE)
CWE-347- Platform
- Python (PyPI)
- Package
django-ses- Disclosed
- 22.05.2023
- Updated
- 11.10.2026 15:17
Sources and licenses
OSV / GitHub Advisory Database - PYSEC-2023-82 - PyPA Advisory Database; CC BY 4.0
OSV / GitHub Advisory Database - GHSA-qg36-9jxh-fj25 - CC BY 4.0
Vulnerability history: django-ses
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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