Vulnerability Description
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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Pylonsproject | Webob | < 1.8.10 |
Related Weaknesses (CWE)
References
- https://github.com/Pylons/webob/security/advisories/GHSA-fh3h-vg37-cc95MitigationVendor Advisory
FAQ
What is CVE-2026-44889?
CVE-2026-44889 is a vulnerability with a CVSS score of 6.1 (MEDIUM). 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 tar...
How severe is CVE-2026-44889?
CVE-2026-44889 has been rated MEDIUM with a CVSS base score of 6.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-44889?
Check the references section above for vendor advisories and patch information. Affected products include: Pylonsproject Webob.