Open Redirect Affecting python-webob package, versions <1:1.8.5-2ubuntu0.1+esm1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.21% (12th percentile)

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  • Snyk IDSNYK-UBUNTU2004-PYTHONWEBOB-17684280
  • published14 Sept 2026
  • disclosed22 Jun 2026

Introduced: 22 Jun 2026

CVE-2026-44889  (opens in a new tab)
CWE-601  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 python-webob to version 1:1.8.5-2ubuntu0.1+esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python-webob package and not the python-webob package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

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 Base Scores

version 3.1