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Medium

Django denial-of-service possibility in urlize and urlizetrunc template filters

  • Disclosed: 09.03.2018
  • Updated: 11.10.2026 11:20

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.

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
Python (PyPI) django >= 2.0a1, < 2.0.3, >= 1.11a1, < 1.11.11, >= 1.8a1, < 1.8.19 2.0.3, 1.11.11, 1.8.19

References

CVSS score 5.3/10
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE)
CWE-185
Platform
Python (PyPI)
Package
django
Disclosed
09.03.2018
Updated
11.10.2026 11:20

Sources and licenses

OSV / GitHub Advisory Database - PYSEC-2018-5 - PyPA Advisory Database; CC BY 4.0

OSV / GitHub Advisory Database - GHSA-r28v-mw67-m5p9 - CC BY 4.0

Vulnerability history: django

All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (162) in the archive
Total entries
162
First → latest
10.2007 08.2026
Without a fix
1
Exploited in attacks
0

Severity breakdown

  • Critical 16
  • High 65
  • Medium 63
  • Low 18

Disclosures per year

earlier: 56

Severity:
  1. Django GeoDjango spatial lookups allow file writes and outbound requests through GDAL raster parsing
    High · 8.8 CVE-2026-15307 < 5.2.17, >= 6.0a1, < 6.0.8 5.2.17, 6.0.8
  2. Django vulnerable to ASGI header spoofing via underscore/hyphen conflation
    High · 7.5 CVE-2026-3902 >= 6.0, < 6.0.4, >= 5.2, < 5.2.13, >= 4.2, < 4.2.30 6.0.4, 5.2.13, 4.2.30
  3. Django: SGI requests with a missing or understated `Content-Length` header could bypass the `DATA_UPLOAD_MAX_MEMORY_SIZE` limit
    High · 7.5 CVE-2026-33034 >= 6.0, < 6.0.4, >= 5.2, < 5.2.13, >= 4.2, < 4.2.30 6.0.4, 5.2.13, 4.2.30
  4. Django vulnerable to Uncontrolled Resource Consumption
    High · 7.5 CVE-2026-25673 >= 6.0, < 6.0.3, >= 5.2, < 5.2.12, >= 4.2, < 4.2.29 6.0.3, 5.2.12, 4.2.29
  5. Django has an SQL Injection issue
    High CVE-2026-1287 >= 6.0a1, < 6.0.2, >= 5.2a1, < 5.2.11, >= 4.2a1, < 4.2.28 6.0.2, 5.2.11, 4.2.28
  6. Django has an SQL Injection issue
    High CVE-2026-1207 >= 6.0a1, < 6.0.2, >= 5.2a1, < 5.2.11, >= 4.2a1, < 4.2.28 6.0.2, 5.2.11, 4.2.28
  7. An issue was discovered in 5.1 before 5.1.14, 4.2 before 4.2.26, and 5.2 before 5.2.8.
    Critical · 9.1 CVE-2025-64459 >= 4.2, < 4.2.26, >= 5.1, < 5.1.14, >= 5.2, < 5.2.8 4.2.26, 5.1.14, 5.2.8
  8. Django has a denial-of-service vulnerability in HttpResponseRedirect and HttpResponsePermanentRedirect on Windows
    High · 7.5 CVE-2025-64458 >= 5.2a1, < 5.2.8, >= 5.0a1, < 5.1.14, < 4.2.26 5.2.8, 5.1.14, 4.2.26
  9. Django vulnerable to SQL injection in column aliases
    High · 7.1 CVE-2025-59681 >= 4.2, < 4.2.25, >= 5.1, < 5.1.13, >= 5.2, < 5.2.7 4.2.25, 5.1.13, 5.2.7
  10. Django is subject to SQL injection through its column aliases
    High · 7.1 CVE-2025-57833 < 4.2.24, >= 5.0a1, < 5.1.12, >= 5.2a1, < 5.2.6 4.2.24, 5.1.12, 5.2.6
  11. Django SQL injection in HasKey(lhs, rhs) on Oracle
    High · 9.8 CVE-2024-53908 >= 5.0.0, < 5.0.10, >= 5.1.0, < 5.1.4, >= 4.2.0, < 4.2.17, >= 5.1, < 5.1.4, >= 5.0, < 5.0.10, >= 4.2, < 4.2.17 5.0.10, 5.1.4, 4.2.17
  12. An issue was discovered in Django 5.0 before 5.0.8 and 4.2 before 4.2.15. QuerySet.values() and values_list() methods on models with a JSONField are subject to SQL injection in column aliases via a cr
    Critical · 9.1 CVE-2024-42005 >= 5.0, < 5.0.8, >= 4.2, < 4.2.15 5.0.8, 4.2.15
  13. Django vulnerable to Denial of Service
    High · 7.5 CVE-2024-39614 >= 5.0, < 5.0.7, >= 4.2, < 4.2.14 5.0.7, 4.2.14
  14. Django Path Traversal vulnerability
    High · 7.5 CVE-2024-39330 >= 5.0, < 5.0.7, >= 4.2, < 4.2.14 5.0.7, 4.2.14
  15. Django vulnerable to Denial of Service
    High · 7.5 CVE-2024-38875 >= 4.2, < 4.2.14, >= 5.0, < 5.0.7 4.2.14, 5.0.7
  16. Django denial-of-service attack in the intcomma template filter
    High · 5.9 CVE-2024-24680 >= 3.2, < 3.2.24, >= 4.2, < 4.2.10, >= 5.0, < 5.0.2 3.2.24, 4.2.10, 5.0.2
  17. In Django 3.2 before 3.2.22, 4.1 before 4.1.12, and 4.2 before 4.2.6, the django.utils.text.Truncator chars() and words() methods (when used with html=True) are subject to a potential DoS (denial of s
    High · 5.9 CVE-2023-43665 >= 3.2, < 3.2.22, >= 4.1, < 4.1.12, >= 4.2, < 4.2.6 3.2.22, 4.1.12, 4.2.6
  18. An issue was discovered in Django 3.2 before 3.2.23, 4.1 before 4.1.13, and 4.2 before 4.2.7. The NFKC normalization is slow on Windows. As a consequence, django.contrib.auth.forms.UsernameField is su
    High · 7.5 CVE-2023-46695 >= 3.2, < 3.2.23, >= 4.1, < 4.1.13, >= 4.2, < 4.2.7 3.2.23, 4.1.13, 4.2.7
  19. In Django 3.2 before 3.2.20, 4 before 4.1.10, and 4.2 before 4.2.3, EmailValidator and URLValidator are subject to a potential ReDoS (regular expression denial of service) attack via a very large numb
    High · 7.5 CVE-2023-36053 >= 4.2, < 4.2.3, >= 4.0, < 4.1.10, >= 3.2, < 3.2.20 4.2.3, 4.1.10, 3.2.20
  20. In Django 3.2 before 3.2.19, 4.x before 4.1.9, and 4.2 before 4.2.1, it was possible to bypass validation when using one form field to upload multiple files. This multiple upload has never been suppor
    Critical · 9.8 CVE-2023-31047 >= 3.2, < 3.2.19, >= 4.0, < 4.1.9, >= 4.2, < 4.2.1 3.2.19, 4.1.9, 4.2.1
  21. An issue was discovered in the Multipart Request Parser in Django 3.2 before 3.2.18, 4.0 before 4.0.10, and 4.1 before 4.1.7. Passing certain inputs (e.g., an excessive number of parts) to multipart f
    High · 7.5 CVE-2023-24580 >= 3.2, < 3.2.18, >= 4.0, < 4.0.10, >= 4.1, < 4.1.7 3.2.18, 4.0.10, 4.1.7
  22. In Django 3.2 before 3.2.17, 4.0 before 4.0.9, and 4.1 before 4.1.6, the parsed values of Accept-Language headers are cached in order to avoid repetitive parsing. This leads to a potential denial-of-s
    High · 7.5 CVE-2023-23969 >= 3.2, < 3.2.17, >= 4.0, < 4.0.9, >= 4.1, < 4.1.6 3.2.17, 4.0.9, 4.1.6
  23. In Django 3.2 before 3.2.16, 4.0 before 4.0.8, and 4.1 before 4.1.2, internationalized URLs were subject to a potential denial of service attack via the locale parameter, which is treated as a regular
    High · 7.5 CVE-2022-41323 >= 3.2, < 3.2.16, >= 4.0, < 4.0.8, >= 4.1, < 4.1.2 3.2.16, 4.0.8, 4.1.2
  24. Django vulnerable to Reflected File Download attack
    High · 8.8 CVE-2022-36359 < 3.2.15, >= 4.0, < 4.0.7 3.2.15, 4.0.7
  25. Django `Trunc()` and `Extract()` database functions vulnerable to SQL Injection
    Critical · 9.8 CVE-2022-34265 >= 3.2a1, < 3.2.14, >= 4.0a1, < 4.0.6 3.2.14, 4.0.6
  26. Django Arbitrary Code Execution
    High CVE-2007-0404 >= 0.95, < 1.0 1.0
  27. SQL Injection in Django
    Critical · 9.8 CVE-2022-28347 >= 2.2, < 2.2.28, >= 3.2, < 3.2.13, >= 4.0, < 4.0.4 2.2.28, 3.2.13, 4.0.4
  28. SQL Injection in Django
    Critical · 9.8 CVE-2022-28346 >= 2.2, < 2.2.28, >= 3.2, < 3.2.13, >= 4.0, < 4.0.4 2.2.28, 3.2.13, 4.0.4
  29. Infinite Loop in Django
    High · 7.5 CVE-2022-23833 >= 2.2, < 2.2.27, >= 3.2, < 3.2.12, >= 4.0, < 4.0.2 2.2.27, 3.2.12, 4.0.2
  30. Information disclosure in Django
    High · 7.5 CVE-2021-45116 >= 2.2, < 2.2.26, >= 3.2, < 3.2.11, >= 4.0, < 4.0.1 2.2.26, 3.2.11, 4.0.1
  31. Denial-of-service in Django
    High · 7.5 CVE-2021-45115 >= 2.2a1, < 2.2.26, >= 3.2a1, < 3.2.11, >= 4.0a1, < 4.0.1 2.2.26, 3.2.11, 4.0.1
  32. SQL Injection in Django
    Critical · 9.8 CVE-2021-35042 >= 3.2a1, < 3.2.5, >= 3.0a1, < 3.1.13 3.2.5, 3.1.13
  33. Django Access Control Bypass possibly leading to SSRF, RFI, and LFI attacks
    High · 7.5 CVE-2021-33571 >= 2.2a1, < 2.2.24, >= 3.0a1, < 3.1.12, >= 3.2a1, < 3.2.4 2.2.24, 3.1.12, 3.2.4
  34. Path Traversal in Django
    High · 7.5 CVE-2021-31542 >= 2.2, < 2.2.21, >= 3.0, < 3.1.9, >= 3.2, < 3.2.1 2.2.21, 3.1.9, 3.2.1
  35. Django Incorrect Default Permissions
    High · 7.5 CVE-2020-24583 >= 2.2a1, < 2.2.16, >= 3.0a1, < 3.0.10, >= 3.1a1, < 3.1.1 2.2.16, 3.0.10, 3.1.1
  36. Data leakage via cache key collision in Django
    High · 5.9 CVE-2020-13254 >= 2.2, < 2.2.13, >= 3.0, < 3.0.7 2.2.13, 3.0.7
  37. Django 1.11 before 1.11.29, 2.2 before 2.2.11, and 3.0 before 3.0.4 allows SQL Injection if untrusted data is used as a tolerance parameter in GIS functions and aggregates on Oracle. By passing a suit
    High · 8.8 CVE-2020-9402 >= 1.11, < 1.11.29, >= 2.2, < 2.2.11, >= 3.0, < 3.0.4 1.11.29, 2.2.11, 3.0.4
  38. SQL injection in Django
    Critical · 9.8 CVE-2020-7471 < 1.11.28, >= 2.0, < 2.2.10, >= 3.0, < 3.0.3 1.11.28, 2.2.10, 3.0.3
  39. Django Potential account hijack via password reset form
    Critical · 9.8 CVE-2019-19844 < 1.11.27, >= 2.0, < 2.2.9, >= 3.0, < 3.0.1 1.11.27, 2.2.9, 3.0.1
  40. Django allows unintended model editing
    High · 6.5 CVE-2019-19118 >= 2.1, < 2.1.15, >= 2.2, < 2.2.8 2.1.15, 2.2.8
  41. SQL Injection in Django
    Critical · 9.8 CVE-2019-14234 >= 1.11a1, < 1.11.23, >= 2.1a1, < 2.1.11, >= 2.2a1, < 2.2.4 1.11.23, 2.1.11, 2.2.4
  42. Uncontrolled Recursion in Django
    High · 7.5 CVE-2019-14235 >= 1.11a1, < 1.11.23, >= 2.1a1, < 2.1.11, >= 2.2a1, < 2.2.4 1.11.23, 2.1.11, 2.2.4
  43. Django Denial-of-service in strip_tags()
    High · 7.5 CVE-2019-14233 >= 1.11a1, < 1.11.23, >= 2.1a1, < 2.1.11, >= 2.2a1, < 2.2.4 1.11.23, 2.1.11, 2.2.4
  44. Django Denial-of-service in django.utils.text.Truncator
    High · 7.5 CVE-2019-14232 >= 1.11a1, < 1.11.23, >= 2.1a1, < 2.1.11, >= 2.2a1, < 2.2.4 1.11.23, 2.1.11, 2.2.4
  45. Uncontrolled Memory Consumption in Django
    High · 7.5 CVE-2019-6975 >= 1.11, < 1.11.19, >= 2.0, < 2.0.11, >= 2.1, < 2.1.6 1.11.19, 2.0.11, 2.1.6
  46. Improper Input Validation in Django
    High · 6.5 CVE-2019-3498 >= 1.11a1, < 1.11.18, >= 2.0a1, < 2.0.10, >= 2.1a1, < 2.1.5 1.11.18, 2.0.10, 2.1.5
  47. Django denial-of-service possibility in urlize and urlizetrunc template filters this entry
    Medium · 5.3 CVE-2018-7536 >= 2.0a1, < 2.0.3, >= 1.11a1, < 1.11.11, >= 1.8a1, < 1.8.19 2.0.3, 1.11.11, 1.8.19
  48. Django vulnerable to information leakage in AuthenticationForm
    High · 7.5 CVE-2018-6188 >= 2.0a1, < 2.0.2, >= 1.11.8, < 1.11.10 2.0.2, 1.11.10
  49. Django before 1.8.x before 1.8.16, 1.9.x before 1.9.11, and 1.10.x before 1.10.3, when settings.DEBUG is True, allow remote attackers to conduct DNS rebinding attacks by leveraging failure to validate
    Critical · 8.1 CVE-2016-9014 < 1.8.16, >= 1.9, < 1.9.11, >= 1.10, < 1.10.3 1.8.16, 1.9.11, 1.10.3
  50. Django 1.8.x before 1.8.16, 1.9.x before 1.9.11, and 1.10.x before 1.10.3 use a hardcoded password for a temporary database user created when running tests with an Oracle database, which makes it easi
    Critical · 9.8 CVE-2016-9013 >= 1.8, < 1.8.16, >= 1.9, < 1.9.11, >= 1.10, < 1.10.3 1.8.16, 1.9.11, 1.10.3
  51. The cookie parsing code in Django before 1.8.15 and 1.9.x before 1.9.10, when used on a site with Google Analytics, allows remote attackers to bypass an intended CSRF protection mechanism by setting a
    High · 7.5 CVE-2016-7401 < 1.8.15, >= 1.9, < 1.9.10 1.8.15, 1.9.10
  52. Django 1.9.x before 1.9.2, when ModelAdmin.save_as is set to True, allows remote authenticated users to bypass intended access restrictions and create ModelAdmin objects via the "Save as New" option w
    High · 5.5 CVE-2016-2048 >= 1.9, < 1.9.2 1.9.2
  53. Django before 1.4.21, 1.5.x through 1.6.x, 1.7.x before 1.7.9, and 1.8.x before 1.8.3 uses an incorrect regular expression, which allows remote attackers to inject arbitrary headers and conduct HTTP r
    High · 7.5 CVE-2015-5144 < 1.4.21, >= 1.5, < 1.7.9, >= 1.8, < 1.8.3 1.4.21, 1.7.9, 1.8.3
  54. validators.URLValidator in Django 1.8.x before 1.8.3 allows remote attackers to cause a denial of service (CPU consumption) via unspecified vectors.
    High · 7.5 CVE-2015-5145 >= 1.8, < 1.8.3 1.8.3
  55. Django Denial-of-service by filling session store
    High · 7.5 CVE-2015-5143 < 1.4.21, >= 1.5, < 1.7.9, >= 1.8, < 1.8.3 1.4.21, 1.7.9, 1.8.3
  56. The utils.html.strip_tags function in Django 1.6.x before 1.6.11, 1.7.x before 1.7.7, and 1.8.x before 1.8c1, when using certain versions of Python, allows remote attackers to cause a denial of servic
    High · 7.5 CVE-2015-2316 >= 1.6, < 1.6.11, >= 1.7, < 1.7.7, >= 1.8a0, < 1.8c1 1.6.11, 1.7.7, 1.8c1
  57. The django.views.static.serve view in Django before 1.4.18, 1.6.x before 1.6.10, and 1.7.x before 1.7.3 reads files an entire line at a time, which allows remote attackers to cause a denial of service
    High · 7.5 CVE-2015-0221 < 1.4.18, >= 1.5, < 1.6.10, >= 1.7, < 1.7.3 1.4.18, 1.6.10, 1.7.3
  58. ModelMultipleChoiceField in Django 1.6.x before 1.6.10 and 1.7.x before 1.7.3, when show_hidden_initial is set to True, allows remote attackers to cause a denial of service by submitting duplicate val
    High · 7.5 CVE-2015-0222 < 1.4.18, >= 1.5, < 1.6.10, >= 1.7, < 1.7.3 1.4.18, 1.6.10, 1.7.3
  59. The default configuration for the file upload handling system in Django before 1.4.14, 1.5.x before 1.5.9, 1.6.x before 1.6.6, and 1.7 before release candidate 3 uses a sequential file name generation
    High · 7.5 CVE-2014-0481 < 1.4.14, >= 1.5, < 1.5.9, >= 1.6, < 1.6.6 1.4.14, 1.5.9, 1.6.6
  60. The core.urlresolvers.reverse function in Django before 1.4.14, 1.5.x before 1.5.9, 1.6.x before 1.6.6, and 1.7 before release candidate 3 does not properly validate URLs, which allows remote attacker
    High · 7.5 CVE-2014-0480 < 1.4.14, >= 1.5, < 1.5.9, >= 1.6, < 1.6.6 1.4.14, 1.5.9, 1.6.6
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