---
id: CVE-2026-54770
title: WebOb provides objects for HTTP requests and responses
summary: >-
  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 le…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-601
vendor: Red Hat
product: Red Hat OpenStack Platform 16.2
affected:
  - ceph_storage 4
  - ceph_storage 7
  - ceph_storage 8
  - enterprise_linux 6
  - enterprise_linux 7
  - openshift_container_platform 4
  - openstack_platform_13_queens
  - openstack_platform 16.2
  - openstack_platform 17.1
  - openstack_platform 18.0
  - quay 3
patched:
  - webob 1.8.11
published: '2026-08-20'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T20:09:01.757'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54770'
references:
  - url: >-
      https://github.com/Pylons/webob/commit/ff89560643fb252751b4db8806a283b5377f1f07
    label: security-advisories@github.com
  - url: 'https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g'
    label: security-advisories@github.com
  - url: 'https://github.com/Pylons/webob/tree/1.8.11'
    label: security-advisories@github.com
  - url: 'https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54770.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-54770'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2520616'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-54770'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-54770'
  - url: 'https://github.com/Pylons/webob'
  - url: 'https://pypi.org/project/webob'
  - url: 'https://github.com/advisories/GHSA-6hx8-3wjj-gr8g'
  - url: 'https://access.redhat.com/errata/RHSA-2026:69255'
tags:
  - nvd
  - csaf
  - vex
  - red-hat
  - osv
  - pip
  - ghsa
epss: 0.00339
epssPercentile: 0.27401
aliases:
  - GHSA-6hx8-3wjj-gr8g
  - PYSEC-2026-3943
ecosystem: pip
scores:
  nvd: 6.1
  vendor: 7.4
  osv: 6.1
ingestedAt: '2026-08-27T23:09:35.958Z'
---

## 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](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54770.json)
- **RHSA-2026:69255** · Red Hat · fixed in: Red Hat Quay 3.16 · released 2026-09-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:69255)