Open redirect in py3-webob - CVE-2026-54770
Published: November 9, 2026
Vulnerability identifier: #VU162711
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-54770
CWE-ID: CWE-601
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated remote attacker to redirect users from a trusted WebOb application to an attacker-controlled host.
The vulnerability exists due to inconsistent Location header validation and URL normalization on Python 3.10+, where leading spaces or C0 control characters conceal an external redirect destination from validation. An unauthenticated remote attacker can supply a crafted destination when the application accepts attacker-influenced redirect targets, causing off-site navigation when a user follows the redirect.
Affected software
py3-webob
Anolis OS
python3-webob
python3-webob-doc
Anolis OS
python3-webob
python3-webob-doc
How to mitigate CVE-2026-54770
Install security update from vendor's website.
py3-webob - update to 1.8.11
python3-webob - update to 1.8.10-2
python3-webob-doc - update to 1.8.10-2
python3-webob - update to 1.8.10-2
python3-webob-doc - update to 1.8.10-2