p PatchFirst

CVE-2026-84429

CVE-2026-84429 · Potential denial-of-service vulnerability in HTTP header parsing

This page contains facts from public vulnerability sources. Check the original advisory before updating.

An issue was discovered in Django 6.1 before 6.1.2, 6.0 before 6.0.9, and 5.2 before 5.2.18. `django.utils.http.parse_header_parameters()` was subject to a potential denial-of-service attack due to quadratic time complexity when parsing a value with many separators inside a quoted parameter. An unauthenticated request could reach this parsing through headers such as `Accept` or `Content-Type`, for instance via the content negotiation performed by `HttpRequest.accepts()`. The per-call length limit does not bound the combined size of repeated headers. Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected. Django would like to thank Jisung Chae for reporting this issue.

CVSS 6.9 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • django

    Versions
    • ≥ 6.1, < 6.1.2: Affected (python)
    • 6.1.2: Not affected (python)
    • ≥ 6.0, < 6.0.9: Affected (python)
    • 6.0.9: Not affected (python)
    • ≥ 5.2, < 5.2.18: Affected (python)
    • 5.2.18: Not affected (python)

    Update to 5.2.18; Update to 6.0.9; Update to 6.1.2

  • python-django Debian:12

    Versions
    • 3:3.2.19-1
    • 3:3.2.19-1+deb12u1
    • 3:3.2.19-1+deb12u1~bpo11+1
    • 3:3.2.19-1+deb12u2
    • 3:3.2.20-1
    • 3:3.2.20-1.1
    • 3:3.2.21-1
    • 3:3.2.25-0+deb12u1
    • 3:3.2.25-0+deb12u2
    • 3:3.2.25-0+deb12u3
    • 3:3.2.25-0+deb12u4
    • 3:3.2.25-0+deb12u5
    • 3:4.1-1
    • 3:4.1.1-1
    • 3:4.1.2-1
    • 3:4.1.3-1
    • 3:4.1.4-1
    • 3:4.1.5-1
    • 3:4.2-1
    • 3:4.2.1-1
    • 3:4.2.10-1
    • 3:4.2.11-1
    • 3:4.2.13-1
    • 3:4.2.14-1
    • 3:4.2.15-1
    • 3:4.2.15-1~bpo12+1
    • 3:4.2.16-1
    • 3:4.2.17-1
    • 3:4.2.17-2
    • 3:4.2.18-1
    • 3:4.2.18-1~bpo12+1
    • 3:4.2.19-1
    • 3:4.2.19-1~bpo12+1
    • 3:4.2.2-1
    • 3:4.2.20-1
    • 3:4.2.20-1~bpo12+1
    • 3:4.2.21-1
    • 3:4.2.21-1~bpo12+1
    • 3:4.2.22-1
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.3-1
    • 3:4.2.30-1
    • 3:4.2.4-1
    • 3:4.2.5-1
    • 3:4.2.5-2
    • 3:4.2.6-1
    • 3:4.2.8-1
    • 3:4.2.9-1
    • 3:4.2~alpha1-1
    • 3:4.2~beta1-1
    • 3:4.2~rc1-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.15-1
    • 3:5.2.15-2
    • 3:5.2.15-2~bpo13+1
    • 3:5.2.16-1
    • 3:5.2.16-1~bpo13+1
    • 3:5.2.17-1
    • 3:5.2.17-2
    • 3:5.2.17-2~bpo13+1
    • 3:5.2.18-1
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    • 3:6.0-1
    • 3:6.0.1-1
    • 3:6.0.2-1
    • 3:6.0.3-1
    • 3:6.0.4-1
    • 3:6.0.5-1
    • 3:6.0.6-1
    • 3:6.0~alpha1-1
    • 3:6.0~beta1-1
    • 3:6.0~rc1-1
    • 3:6.1-1
    • 3:6.1.1-1
    • 3:6.1.2-1
    • 3:6.1~beta1-1
    • 3:6.1~rc1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Debian:13

    Versions
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-0+deb13u1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-0+deb13u1
    • 3:4.2.28-0+deb13u2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.30-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.15-1
    • 3:5.2.15-2
    • 3:5.2.15-2~bpo13+1
    • 3:5.2.16-1
    • 3:5.2.16-1~bpo13+1
    • 3:5.2.17-1
    • 3:5.2.17-2
    • 3:5.2.17-2~bpo13+1
    • 3:5.2.18-1
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    • 3:6.0-1
    • 3:6.0.1-1
    • 3:6.0.2-1
    • 3:6.0.3-1
    • 3:6.0.4-1
    • 3:6.0.5-1
    • 3:6.0.6-1
    • 3:6.0~alpha1-1
    • 3:6.0~beta1-1
    • 3:6.0~rc1-1
    • 3:6.1-1
    • 3:6.1.1-1
    • 3:6.1.2-1
    • 3:6.1~beta1-1
    • 3:6.1~rc1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Debian:14

    Versions
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.30-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.15-1
    • 3:5.2.15-2
    • 3:5.2.15-2~bpo13+1
    • 3:5.2.16-1
    • 3:5.2.16-1~bpo13+1
    • 3:5.2.17-1
    • 3:5.2.17-2
    • 3:5.2.17-2~bpo13+1
    • 3:5.2.18-1
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    • 3:6.0-1
    • 3:6.0.1-1
    • 3:6.0.2-1
    • 3:6.0.3-1
    • 3:6.0.4-1
    • 3:6.0.5-1
    • 3:6.0.6-1
    • 3:6.0~alpha1-1
    • 3:6.0~beta1-1
    • 3:6.0~rc1-1
    • 3:6.1-1
    • 3:6.1.1-1
    • 3:6.1.2-1
    • 3:6.1~beta1-1
    • 3:6.1~rc1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:14.04:LTS

    Versions
    • 1.5.4-1ubuntu1
    • 1.6-1
    • 1.6.1-1
    • 1.6.1-2
    • 1.6.1-2ubuntu0.1
    • 1.6.1-2ubuntu0.2
    • 1.6.1-2ubuntu0.3
    • 1.6.1-2ubuntu0.4
    • 1.6.1-2ubuntu0.5
    • 1.6.1-2ubuntu0.6
    • 1.6.1-2ubuntu0.8
    • 1.6.1-2ubuntu0.9
    • 1.6.1-2ubuntu0.10
    • 1.6.1-2ubuntu0.11
    • 1.6.1-2ubuntu0.12
    • 1.6.1-2ubuntu0.13
    • 1.6.1-2ubuntu0.14
    • 1.6.1-2ubuntu0.15
    • 1.6.1-2ubuntu0.16
    • 1.6.11-0ubuntu1
    • 1.6.11-0ubuntu1.1
    • 1.6.11-0ubuntu1.2
    • 1.6.11-0ubuntu1.3
    • 1.6.11-0ubuntu1.3+esm1
    • 1.6.11-0ubuntu1.3+esm2
    • 1.6.11-0ubuntu1.3+esm3
    • 1.6.11-0ubuntu1.3+esm4
    • 1.6.11-0ubuntu1.3+esm5
    • 1.6.11-0ubuntu1.3+esm6
    • 1.6.11-0ubuntu1.3+esm7
    • 1.6.11-0ubuntu1.3+esm8
    • 1.6.11-0ubuntu1.3+esm9
    • 1.6.11-0ubuntu1.3+esm10
    • 1.6.11-0ubuntu1.3+esm11
    • 1.6.11-0ubuntu1.3+esm12
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:16.04:LTS

    Versions
    • 1.7.9-1ubuntu5
    • 1.8.5-2ubuntu1
    • 1.8.7-1ubuntu1
    • 1.8.7-1ubuntu2
    • 1.8.7-1ubuntu3
    • 1.8.7-1ubuntu4
    • 1.8.7-1ubuntu5
    • 1.8.7-1ubuntu5.1
    • 1.8.7-1ubuntu5.2
    • 1.8.7-1ubuntu5.4
    • 1.8.7-1ubuntu5.5
    • 1.8.7-1ubuntu5.6
    • 1.8.7-1ubuntu5.7
    • 1.8.7-1ubuntu5.8
    • 1.8.7-1ubuntu5.9
    • 1.8.7-1ubuntu5.10
    • 1.8.7-1ubuntu5.11
    • 1.8.7-1ubuntu5.12
    • 1.8.7-1ubuntu5.13
    • 1.8.7-1ubuntu5.14
    • 1.8.7-1ubuntu5.15
    • 1.8.7-1ubuntu5.15+esm1
    • 1.8.7-1ubuntu5.15+esm3
    • 1.8.7-1ubuntu5.15+esm4
    • 1.8.7-1ubuntu5.15+esm5
    • 1.8.7-1ubuntu5.15+esm6
    • 1.8.7-1ubuntu5.15+esm7
    • 1.8.7-1ubuntu5.15+esm8
    • 1.8.7-1ubuntu5.15+esm9
    • 1.8.7-1ubuntu5.15+esm10
    • 1.8.7-1ubuntu5.15+esm11
    • 1.8.7-1ubuntu5.15+esm12
    • 1.8.7-1ubuntu5.15+esm13
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:18.04:LTS

    Versions
    • 1:1.11.4-1ubuntu1
    • 1:1.11.6-1ubuntu1
    • 1:1.11.9-1ubuntu1
    • 1:1.11.11-1ubuntu1
    • 1:1.11.11-1ubuntu1.1
    • 1:1.11.11-1ubuntu1.2
    • 1:1.11.11-1ubuntu1.3
    • 1:1.11.11-1ubuntu1.4
    • 1:1.11.11-1ubuntu1.5
    • 1:1.11.11-1ubuntu1.6
    • 1:1.11.11-1ubuntu1.7
    • 1:1.11.11-1ubuntu1.8
    • 1:1.11.11-1ubuntu1.9
    • 1:1.11.11-1ubuntu1.10
    • 1:1.11.11-1ubuntu1.11
    • 1:1.11.11-1ubuntu1.12
    • 1:1.11.11-1ubuntu1.13
    • 1:1.11.11-1ubuntu1.14
    • 1:1.11.11-1ubuntu1.15
    • 1:1.11.11-1ubuntu1.16
    • 1:1.11.11-1ubuntu1.17
    • 1:1.11.11-1ubuntu1.18
    • 1:1.11.11-1ubuntu1.19
    • 1:1.11.11-1ubuntu1.20
    • 1:1.11.11-1ubuntu1.21
    • 1:1.11.11-1ubuntu1.21+esm1
    • 1:1.11.11-1ubuntu1.21+esm2
    • 1:1.11.11-1ubuntu1.21+esm3
    • 1:1.11.11-1ubuntu1.21+esm4
    • 1:1.11.11-1ubuntu1.21+esm5
    • 1:1.11.11-1ubuntu1.21+esm6
    • 1:1.11.11-1ubuntu1.21+esm7
    • 1:1.11.11-1ubuntu1.21+esm8
    • 1:1.11.11-1ubuntu1.21+esm9
    • 1:1.11.11-1ubuntu1.21+esm10
    • 1:1.11.11-1ubuntu1.21+esm11
    • 1:1.11.11-1ubuntu1.21+esm12
    • 1:1.11.11-1ubuntu1.21+esm13
    • 1:1.11.11-1ubuntu1.21+esm14
    • 1:1.11.11-1ubuntu1.21+esm15
    • 1:1.11.11-1ubuntu1.21+esm17
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:20.04:LTS

    Versions
    • 1:1.11.22-1ubuntu1
    • 2:2.2.6-1ubuntu1
    • 2:2.2.9-2ubuntu1
    • 2:2.2.10-1
    • 2:2.2.10-1ubuntu1
    • 2:2.2.11-1
    • 2:2.2.12-1
    • 2:2.2.12-1ubuntu0.1
    • 2:2.2.12-1ubuntu0.2
    • 2:2.2.12-1ubuntu0.3
    • 2:2.2.12-1ubuntu0.4
    • 2:2.2.12-1ubuntu0.5
    • 2:2.2.12-1ubuntu0.6
    • 2:2.2.12-1ubuntu0.7
    • 2:2.2.12-1ubuntu0.8
    • 2:2.2.12-1ubuntu0.9
    • 2:2.2.12-1ubuntu0.10
    • 2:2.2.12-1ubuntu0.11
    • 2:2.2.12-1ubuntu0.12
    • 2:2.2.12-1ubuntu0.13
    • 2:2.2.12-1ubuntu0.14
    • 2:2.2.12-1ubuntu0.15
    • 2:2.2.12-1ubuntu0.16
    • 2:2.2.12-1ubuntu0.17
    • 2:2.2.12-1ubuntu0.18
    • 2:2.2.12-1ubuntu0.19
    • 2:2.2.12-1ubuntu0.20
    • 2:2.2.12-1ubuntu0.21
    • 2:2.2.12-1ubuntu0.22
    • 2:2.2.12-1ubuntu0.23
    • 2:2.2.12-1ubuntu0.24
    • 2:2.2.12-1ubuntu0.25
    • 2:2.2.12-1ubuntu0.26
    • 2:2.2.12-1ubuntu0.27
    • 2:2.2.12-1ubuntu0.28
    • 2:2.2.12-1ubuntu0.29
    • 2:2.2.12-1ubuntu0.29+esm1
    • 2:2.2.12-1ubuntu0.29+esm2
    • 2:2.2.12-1ubuntu0.29+esm3
    • 2:2.2.12-1ubuntu0.29+esm4
    • 2:2.2.12-1ubuntu0.29+esm5
    • 2:2.2.12-1ubuntu0.29+esm6
    • 2:2.2.12-1ubuntu0.29+esm7
    • 2:2.2.12-1ubuntu0.29+esm8
    • 2:2.2.12-1ubuntu0.29+esm10
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:22.04:LTS

    Versions
    • 2:2.2.24-1ubuntu1
    • 2:3.2.12-2
    • 2:3.2.12-2ubuntu1
    • 2:3.2.12-2ubuntu1.1
    • 2:3.2.12-2ubuntu1.2
    • 2:3.2.12-2ubuntu1.3
    • 2:3.2.12-2ubuntu1.4
    • 2:3.2.12-2ubuntu1.5
    • 2:3.2.12-2ubuntu1.6
    • 2:3.2.12-2ubuntu1.7
    • 2:3.2.12-2ubuntu1.8
    • 2:3.2.12-2ubuntu1.9
    • 2:3.2.12-2ubuntu1.10
    • 2:3.2.12-2ubuntu1.11
    • 2:3.2.12-2ubuntu1.12
    • 2:3.2.12-2ubuntu1.13
    • 2:3.2.12-2ubuntu1.14
    • 2:3.2.12-2ubuntu1.15
    • 2:3.2.12-2ubuntu1.16
    • 2:3.2.12-2ubuntu1.17
    • 2:3.2.12-2ubuntu1.18
    • 2:3.2.12-2ubuntu1.19
    • 2:3.2.12-2ubuntu1.20
    • 2:3.2.12-2ubuntu1.21
    • 2:3.2.12-2ubuntu1.22
    • 2:3.2.12-2ubuntu1.23
    • 2:3.2.12-2ubuntu1.24
    • 2:3.2.12-2ubuntu1.25
    • 2:3.2.12-2ubuntu1.26
    • 2:3.2.12-2ubuntu1.27
    • 2:3.2.12-2ubuntu1.29
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:24.04:LTS

    Versions
    • 3:4.2.4-1ubuntu2
    • 3:4.2.8-1
    • 3:4.2.9-1
    • 3:4.2.11-1
    • 3:4.2.11-1ubuntu1
    • 3:4.2.11-1ubuntu1.1
    • 3:4.2.11-1ubuntu1.2
    • 3:4.2.11-1ubuntu1.3
    • 3:4.2.11-1ubuntu1.4
    • 3:4.2.11-1ubuntu1.5
    • 3:4.2.11-1ubuntu1.6
    • 3:4.2.11-1ubuntu1.7
    • 3:4.2.11-1ubuntu1.8
    • 3:4.2.11-1ubuntu1.9
    • 3:4.2.11-1ubuntu1.10
    • 3:4.2.11-1ubuntu1.11
    • 3:4.2.11-1ubuntu1.12
    • 3:4.2.11-1ubuntu1.13
    • 3:4.2.11-1ubuntu1.14
    • 3:4.2.11-1ubuntu1.15
    • 3:4.2.11-1ubuntu1.16
    • 3:4.2.11-1ubuntu1.18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:26.10

    Versions
    • 3:5.2.9-0ubuntu4
    • 3:5.2.16-1
    • 3:5.2.17-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:26.04:LTS

    Versions
    • 3:5.2.4-1ubuntu2
    • 3:5.2.4-1ubuntu3
    • 3:5.2.9-0ubuntu1
    • 3:5.2.9-0ubuntu2
    • 3:5.2.9-0ubuntu3
    • 3:5.2.9-0ubuntu4
    • 3:5.2.9-0ubuntu4.1
    • 3:5.2.9-0ubuntu4.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →