WebOb provides objects for HTTP requests and responses

Overview

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.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-54770)

Affected packages:

• webob < 1.8.11

Patched in:

• webob 1.8.11

Source: https://osv.dev/vulnerability/GHSA-6hx8-3wjj-gr8g

Vendor advisories

• Red Hat VEX · Important · affected: Red Hat Ceph Storage 4, Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat OpenShift Container Platform 4, … · no fix planned: Red Hat Ceph Storage 4, Red Hat Ceph Storage 7, Red Hat Ceph Storage 8, Red Hat Enterprise Linux 6, … · updated 2026-09-21 · vex
• RHSA-2026:69255 · Red Hat · fixed in: Red Hat Quay 3.16 · released 2026-09-21 · advisory