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CVE-2026-44431

CVE-2026-44431 · urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

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

urllib3 is an HTTP client library for Python. From 1.23 to before 2.7.0, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers. This vulnerability is fixed in 2.7.0.

CVSS 8.2 · High · EPSS 0.3% · Public exploit · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • urllib3

    Versions
    • >= 1.23, < 2.7.0: Affected

    No fix published

  • python-urllib3 Debian:12

    Versions
    • 1.26.12-1
    • 1.26.12-1+deb12u1
    • 1.26.12-1+deb12u2
    • 1.26.12-1+deb12u3
    Affected ranges
    • ECOSYSTEM: < 1.26.12-1+deb12u4

    Update to 1.26.12-1+deb12u4

  • python-urllib3 Debian:13

    Versions
    • 2.3.0-3
    • 2.3.0-3+deb13u1
    Affected ranges
    • ECOSYSTEM: < 2.3.0-3+deb13u2

    Update to 2.3.0-3+deb13u2

  • python-urllib3 Debian:14

    Versions
    • 2.3.0-3
    • 2.5.0-1
    • 2.5.0-1.1
    • 2.5.0-2
    • 2.6.3-1
    • 2.6.3-2
    Affected ranges
    • ECOSYSTEM: < 2.7.0-1

    Update to 2.7.0-1

  • urllib3 PyPI

    Versions
    • 1.23
    • 1.24
    • 1.24.1
    • 1.24.2
    • 1.24.3
    • 1.25
    • 1.25.1
    • 1.25.10
    • 1.25.11
    • 1.25.2
    • 1.25.3
    • 1.25.4
    • 1.25.5
    • 1.25.6
    • 1.25.7
    • 1.25.8
    • 1.25.9
    • 1.26.0
    • 1.26.1
    • 1.26.10
    • 1.26.11
    • 1.26.12
    • 1.26.13
    • 1.26.14
    • 1.26.15
    • 1.26.16
    • 1.26.17
    • 1.26.18
    • 1.26.19
    • 1.26.2
    • 1.26.20
    • 1.26.3
    • 1.26.4
    • 1.26.5
    • 1.26.6
    • 1.26.7
    • 1.26.8
    • 1.26.9
    • 2.0.0
    • 2.0.0a1
    • 2.0.0a2
    • 2.0.0a3
    • 2.0.0a4
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.0.4
    • 2.0.5
    • 2.0.6
    • 2.0.7
    • 2.1.0
    • 2.2.0
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.3.0
    • 2.4.0
    • 2.5.0
    • 2.6.0
    • 2.6.1
    • 2.6.2
    • 2.6.3
    Affected ranges
    • ECOSYSTEM: ≥ 1.23, < 2.7.0

    Update to 2.7.0

  • python-pip Ubuntu:Pro:14.04:LTS

    Versions
    • 1.4.1-2
    • 1.5.4-1
    • 1.5.4-1ubuntu1
    • 1.5.4-1ubuntu3
    • 1.5.4-1ubuntu4
    • 1.5.4-1ubuntu4+esm1
    • 1.5.4-1ubuntu4+esm2
    • 1.5.4-1ubuntu4+esm3
    • 1.5.4-1ubuntu4+esm4
    • 1.5.4-1ubuntu4+esm5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:Pro:14.04:LTS

    Versions
    • 1.6-2
    • 1.7.1-1
    • 1.7.1-1build1
    • 1.7.1-1ubuntu0.1
    • 1.7.1-1ubuntu3
    • 1.7.1-1ubuntu4
    • 1.7.1-1ubuntu4.1
    • 1.7.1-1ubuntu4.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:Pro:16.04:LTS

    Versions
    • 1.11-1
    • 1.12-1
    • 1.13.1-1
    • 1.13.1-2
    • 1.13.1-2ubuntu0.16.04.1
    • 1.13.1-2ubuntu0.16.04.2
    • 1.13.1-2ubuntu0.16.04.3
    • 1.13.1-2ubuntu0.16.04.4
    • 1.13.1-2ubuntu0.16.04.4+esm1
    • 1.13.1-2ubuntu0.16.04.4+esm2
    • 1.13.1-2ubuntu0.16.04.4+esm3
    Affected ranges
    • ECOSYSTEM: < 1.13.1-2ubuntu0.16.04.4+esm4

    Update to 1.13.1-2ubuntu0.16.04.4+esm4

  • python-pip Ubuntu:Pro:16.04:LTS

    Versions
    • 1.5.6-7ubuntu1
    • 1.5.6-7ubuntu2
    • 8.0.2-7
    • 8.0.3-1
    • 8.0.3-2
    • 8.1.0-1
    • 8.1.0-2
    • 8.1.1-1
    • 8.1.1-2
    • 8.1.1-2ubuntu0.1
    • 8.1.1-2ubuntu0.2
    • 8.1.1-2ubuntu0.4
    • 8.1.1-2ubuntu0.6
    • 8.1.1-2ubuntu0.6+esm2
    • 8.1.1-2ubuntu0.6+esm3
    • 8.1.1-2ubuntu0.6+esm4
    • 8.1.1-2ubuntu0.6+esm5
    • 8.1.1-2ubuntu0.6+esm6
    • 8.1.1-2ubuntu0.6+esm8
    • 8.1.1-2ubuntu0.6+esm10
    • 8.1.1-2ubuntu0.6+esm11
    • 8.1.1-2ubuntu0.6+esm12
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:Pro:18.04:LTS

    Versions
    • 1.21.1-1
    • 1.22-1
    • 1.22-1ubuntu0.18.04.1
    • 1.22-1ubuntu0.18.04.2
    • 1.22-1ubuntu0.18.04.2+esm1
    • 1.22-1ubuntu0.18.04.2+esm2
    • 1.22-1ubuntu0.18.04.2+esm3
    Affected ranges
    • ECOSYSTEM: < 1.22-1ubuntu0.18.04.2+esm4

    Update to 1.22-1ubuntu0.18.04.2+esm4

  • python-pip Ubuntu:Pro:18.04:LTS

    Versions
    • 9.0.1-2
    • 9.0.1-2.3~ubuntu1
    • 9.0.1-2.3~ubuntu1.18.04.1
    • 9.0.1-2.3~ubuntu1.18.04.2
    • 9.0.1-2.3~ubuntu1.18.04.3
    • 9.0.1-2.3~ubuntu1.18.04.4
    • 9.0.1-2.3~ubuntu1.18.04.5
    • 9.0.1-2.3~ubuntu1.18.04.5+esm2
    • 9.0.1-2.3~ubuntu1.18.04.5+esm3
    • 9.0.1-2.3~ubuntu1.18.04.6
    • 9.0.1-2.3~ubuntu1.18.04.6+esm1
    • 9.0.1-2.3~ubuntu1.18.04.7
    • 9.0.1-2.3~ubuntu1.18.04.7+esm1
    • 9.0.1-2.3~ubuntu1.18.04.8
    • 9.0.1-2.3~ubuntu1.18.04.8+esm1
    • 9.0.1-2.3~ubuntu1.18.04.8+esm2
    • 9.0.1-2.3~ubuntu1.18.04.8+esm4
    • 9.0.1-2.3~ubuntu1.18.04.8+esm6
    • 9.0.1-2.3~ubuntu1.18.04.8+esm7
    • 9.0.1-2.3~ubuntu1.18.04.8+esm8
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:Pro:20.04:LTS

    Versions
    • 1.24.1-1ubuntu1
    • 1.24.1-1ubuntu2
    • 1.25.8-1
    • 1.25.8-2
    • 1.25.8-2ubuntu0.1
    • 1.25.8-2ubuntu0.2
    • 1.25.8-2ubuntu0.3
    • 1.25.8-2ubuntu0.4
    • 1.25.8-2ubuntu0.4+esm1
    • 1.25.8-2ubuntu0.4+esm2
    • 1.25.8-2ubuntu0.4+esm3
    • 1.25.8-2ubuntu0.4+esm4
    Affected ranges
    • ECOSYSTEM: < 1.25.8-2ubuntu0.4+esm5

    Update to 1.25.8-2ubuntu0.4+esm5

  • python-pip Ubuntu:Pro:20.04:LTS

    Versions
    • 18.1-5
    • 18.1-5build1
    • 18.1-5ubuntu1
    • 20.0.2-2
    • 20.0.2-4
    • 20.0.2-5
    • 20.0.2-5ubuntu1
    • 20.0.2-5ubuntu1.1
    • 20.0.2-5ubuntu1.3
    • 20.0.2-5ubuntu1.4
    • 20.0.2-5ubuntu1.5
    • 20.0.2-5ubuntu1.6
    • 20.0.2-5ubuntu1.7
    • 20.0.2-5ubuntu1.8
    • 20.0.2-5ubuntu1.9
    • 20.0.2-5ubuntu1.10
    • 20.0.2-5ubuntu1.10+esm2
    • 20.0.2-5ubuntu1.11
    • 20.0.2-5ubuntu1.11+esm2
    • 20.0.2-5ubuntu1.11+esm3
    • 20.0.2-5ubuntu1.11+esm4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:22.04:LTS

    Versions
    • 1.26.5-1~exp1
    • 1.26.5-1~exp1ubuntu0.1
    • 1.26.5-1~exp1ubuntu0.2
    • 1.26.5-1~exp1ubuntu0.3
    • 1.26.5-1~exp1ubuntu0.4
    • 1.26.5-1~exp1ubuntu0.5
    • 1.26.5-1~exp1ubuntu0.6
    Affected ranges
    • ECOSYSTEM: < 1.26.5-1~exp1ubuntu0.7

    Update to 1.26.5-1~exp1ubuntu0.7

  • python-pip Ubuntu:Pro:22.04:LTS

    Versions
    • 20.3.4-4
    • 21.3.1+dfsg-3
    • 22.0.2+dfsg-1
    • 22.0.2+dfsg-1ubuntu0.1
    • 22.0.2+dfsg-1ubuntu0.2
    • 22.0.2+dfsg-1ubuntu0.3
    • 22.0.2+dfsg-1ubuntu0.4
    • 22.0.2+dfsg-1ubuntu0.5
    • 22.0.2+dfsg-1ubuntu0.6
    • 22.0.2+dfsg-1ubuntu0.7
    • 22.0.2+dfsg-1ubuntu0.7+esm1
    • 22.0.2+dfsg-1ubuntu0.7+esm2
    • 22.0.2+dfsg-1ubuntu0.7+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:24.04:LTS

    Versions
    • 1.26.16-1
    • 1.26.18-1
    • 2.0.7-1
    • 2.0.7-1ubuntu0.1
    • 2.0.7-1ubuntu0.2
    • 2.0.7-1ubuntu0.3
    • 2.0.7-1ubuntu0.4
    • 2.0.7-1ubuntu0.5
    • 2.0.7-1ubuntu0.6
    Affected ranges
    • ECOSYSTEM: < 2.0.7-1ubuntu0.7

    Update to 2.0.7-1ubuntu0.7

  • python-pip Ubuntu:Pro:24.04:LTS

    Versions
    • 23.2+dfsg-1
    • 23.3+dfsg-1
    • 24.0+dfsg-1
    • 24.0+dfsg-1ubuntu1
    • 24.0+dfsg-1ubuntu1.1
    • 24.0+dfsg-1ubuntu1.2
    • 24.0+dfsg-1ubuntu1.3
    • 24.0+dfsg-1ubuntu1.3+esm1
    • 24.0+dfsg-1ubuntu1.3+esm2
    • 24.0+dfsg-1ubuntu1.3+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-pip Ubuntu:25.10

    Versions
    • 25.0+dfsg-1
    • 25.1.1+dfsg-1
    • 25.1.1+dfsg-1ubuntu1
    • 25.1.1+dfsg-1ubuntu2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:25.10

    Versions
    • 2.3.0-2
    • 2.3.0-2ubuntu1
    • 2.3.0-3
    • 2.3.0-3ubuntu0.1
    • 2.3.0-3ubuntu0.2
    • 2.3.0-3ubuntu0.3
    • 2.3.0-3ubuntu0.4
    Affected ranges
    • ECOSYSTEM: < 2.3.0-3ubuntu0.6

    Update to 2.3.0-3ubuntu0.6

  • python-pip Ubuntu:26.10

    Versions
    • 25.1.1+dfsg-1ubuntu2
    • 26.1.2+dfsg-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-urllib3 Ubuntu:26.04:LTS

    Versions
    • 2.3.0-3
    • 2.5.0-1
    • 2.5.0-1ubuntu1
    • 2.5.0-1ubuntu2
    • 2.6.3-1ubuntu1
    Affected ranges
    • ECOSYSTEM: < 2.6.3-1ubuntu1.1

    Update to 2.6.3-1ubuntu1.1

  • python-pip Ubuntu:Pro:26.04:LTS

    Versions
    • 25.1.1+dfsg-1ubuntu2
    • 25.1.1+dfsg-1ubuntu2+esm1
    • 25.1.1+dfsg-1ubuntu2+esm2
    • 25.1.1+dfsg-1ubuntu2+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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