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CVE-2026-54770

CVE-2026-54770 · WebOb: Open redirect in Location header normalization via leading C0 control / space characters

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

WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.

CVSS 6.1 · Medium · EPSS 0.4% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • webob

    Versions
    • < 1.8.11: 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
    • 1:1.8.10-0+deb13u1
    • 1:1.8.10-1
    • 1:1.8.11-1
    • 1:1.8.9-1
    • 1:1.8.9-2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Debian:14

    Versions
    • 1:1.8.10-1
    • 1:1.8.9-1
    • 1:1.8.9-2
    Affected ranges
    • ECOSYSTEM: < 1:1.8.11-1

    Update to 1:1.8.11-1

  • 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
    • 1.8.10
    • 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: < 1.8.11

    Update to 1.8.11

  • python-webob Ubuntu:Pro:16.04:LTS

    Versions
    • 1.4.1-1
    • 1.5.1-1
    • 1.5.1-1ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Ubuntu:Pro:18.04:LTS

    Versions
    • 1:1.7.2-0ubuntu1
    • 1:1.7.3-0ubuntu1
    • 1:1.7.3-2fakesync1
    • 1:1.7.3-2ubuntu0.1~esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 1:1.8.5-2ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Ubuntu:22.04:LTS

    Versions
    • 1:1.8.6-1.1
    • 1:1.8.6-1.1ubuntu0.1
    • 1:1.8.6-1.1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • 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
    • 1:1.8.7-1ubuntu0.1.24.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Ubuntu:26.10

    Versions
    • 1:1.8.9-1
    • 1:1.8.10-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-webob Ubuntu:26.04:LTS

    Versions
    • 1:1.8.9-1
    • 1:1.8.9-1ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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