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CVE-2026-44889

CVE-2026-44889 · WebOb: Location header normalization during redirect leads to open redirect

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

WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb joins the redirect target to the request URI using Python's urljoin, and since Python 3.10 the underlying urlsplit strips ASCII tab, carriage return, and newline characters before parsing, so a redirect target containing such characters can be reinterpreted as a protocol-relative URL whose authority is an attacker-controlled host. This bypasses the CVE-2024-42353 fix that escaped a leading double slash, allowing an attacker who influences the redirect location to send users to an arbitrary external site instead of the intended one. This vulnerability is fixed in 1.8.10.

CVSS 6.1 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • webob

    Versions
    • < 1.8.10: Affected

    No fix published

  • python-webob Debian:12

    Versions
    • 1:1.8.10-1
    • 1:1.8.11-1
    • 1:1.8.6-3
    • 1:1.8.7-1
    • 1:1.8.7-2
    • 1:1.8.7-3
    • 1:1.8.9-1
    • 1:1.8.9-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Debian:13

    Versions
    • 1:1.8.9-1
    • 1:1.8.9-2
    Affected ranges
    • ECOSYSTEM: < 1:1.8.10-0+deb13u1

    Update to 1:1.8.10-0+deb13u1

  • python-webob Debian:14

    Versions
    • 1:1.8.9-1
    • 1:1.8.9-2
    Affected ranges
    • ECOSYSTEM: < 1:1.8.10-1

    Update to 1:1.8.10-1

  • webob PyPI

    Versions
    • 0.8
    • 0.8.1
    • 0.8.2
    • 0.8.3
    • 0.8.4
    • 0.8.5
    • 0.9
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.4
    • 0.9.5
    • 0.9.6
    • 0.9.6.1
    • 0.9.7
    • 0.9.7.1
    • 0.9.8
    • 1.0
    • 1.0.1
    • 1.0.2
    • 1.0.3
    • 1.0.4
    • 1.0.5
    • 1.0.6
    • 1.0.7
    • 1.0.8
    • 1.1
    • 1.1.1
    • 1.1b2
    • 1.1beta1
    • 1.1rc1
    • 1.2
    • 1.2.1
    • 1.2.2
    • 1.2.3
    • 1.2b1
    • 1.2b2
    • 1.2b3
    • 1.2rc1
    • 1.3
    • 1.3.1
    • 1.4
    • 1.4.1
    • 1.4.2
    • 1.5.0
    • 1.5.0a0
    • 1.5.0a1
    • 1.5.0b0
    • 1.5.1
    • 1.6.0
    • 1.6.0a0
    • 1.6.1
    • 1.6.2
    • 1.6.3
    • 1.6.4
    • 1.7.0
    • 1.7.0rc1
    • 1.7.0rc2
    • 1.7.1
    • 1.7.2
    • 1.7.3
    • 1.7.4
    • 1.8.0
    • 1.8.0rc1
    • 1.8.1
    • 1.8.2
    • 1.8.3
    • 1.8.4
    • 1.8.5
    • 1.8.6
    • 1.8.7
    • 1.8.8
    • 1.8.9
    Affected ranges
    • ECOSYSTEM: < 1.8.10

    Update to 1.8.10

  • python-webob Ubuntu:Pro:16.04:LTS

    Versions
    • 1.4.1-1
    • 1.5.1-1
    Affected ranges
    • ECOSYSTEM: < 1.5.1-1ubuntu0.1~esm2

    Update to 1.5.1-1ubuntu0.1~esm2

  • python-webob Ubuntu:Pro:18.04:LTS

    Versions
    • 1:1.7.2-0ubuntu1
    • 1:1.7.3-0ubuntu1
    • 1:1.7.3-2fakesync1
    Affected ranges
    • ECOSYSTEM: < 1:1.7.3-2ubuntu0.1~esm2

    Update to 1:1.7.3-2ubuntu0.1~esm2

  • python-webob Ubuntu:Pro:20.04:LTS

    Versions
    • 1:1.8.5-1
    • 1:1.8.5-1build1
    • 1:1.8.5-2
    • 1:1.8.5-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 1:1.8.5-2ubuntu0.1+esm1

    Update to 1:1.8.5-2ubuntu0.1+esm1

  • python-webob Ubuntu:22.04:LTS

    Versions
    • 1:1.8.6-1.1
    • 1:1.8.6-1.1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: < 1:1.8.6-1.1ubuntu0.2

    Update to 1:1.8.6-1.1ubuntu0.2

  • python-webob Ubuntu:24.04:LTS

    Versions
    • 1:1.8.6-3
    • 1:1.8.7-1
    • 1:1.8.7-1ubuntu0.1.24.04.1
    Affected ranges
    • ECOSYSTEM: < 1:1.8.7-1ubuntu0.1.24.04.2

    Update to 1:1.8.7-1ubuntu0.1.24.04.2

  • python-webob Ubuntu:25.10

    Versions
    • 1:1.8.9-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Ubuntu:26.04:LTS

    Versions
    • 1:1.8.9-1
    Affected ranges
    • ECOSYSTEM: < 1:1.8.9-1ubuntu0.1

    Update to 1:1.8.9-1ubuntu0.1

Original sources

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