PYSEC-2026-251

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/webob/PYSEC-2026-251.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-251
Aliases
Published
2026-06-22T22:16:46.350Z
Modified
2026-06-27T11:15:06.802750750Z
Severity
  • 6.1 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

PyPI / webob

Package

Name
webob
View open source insights on deps.dev
Purl
pkg:pypi/webob

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.10

Affected versions

0.*
0.8
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.9
0.9.1
0.9.2
0.9.3
0.9.4
0.9.5
0.9.6
0.9.6.1
0.9.7
0.9.7.1
0.9.8
1.*
1.0
1.0.1
1.0.2
1.0.3
1.0.4
1.0.5
1.0.6
1.0.7
1.0.8
1.1beta1
1.1b2
1.1rc1
1.1
1.1.1
1.2b1
1.2b2
1.2b3
1.2rc1
1.2
1.2.1
1.2.2
1.2.3
1.3
1.3.1
1.4
1.4.1
1.4.2
1.5.0a0
1.5.0a1
1.5.0b0
1.5.0
1.5.1
1.6.0a0
1.6.0
1.6.1
1.6.2
1.6.3
1.6.4
1.7.0rc1
1.7.0rc2
1.7.0
1.7.1
1.7.2
1.7.3
1.7.4
1.8.0rc1
1.8.0
1.8.1
1.8.2
1.8.3
1.8.4
1.8.5
1.8.6
1.8.7
1.8.8
1.8.9

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/webob/PYSEC-2026-251.yaml"