OESA-2026-2679

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Source
https://www.openeuler.org/en/security/security-bulletins/detail/?id=openEuler-SA-2026-2679
Import Source
https://repo.openeuler.org/security/data/osv/OESA-2026-2679.json
JSON Data
https://api.osv.dev/v1/vulns/OESA-2026-2679
Upstream
  • CVE-2026-44889
Published
2026-06-12T12:28:37Z
Modified
2026-06-12T12:45:11.901364331Z
Summary
python-webob security update
Details

WebOb provides wrappers around the WSGI request environment, and an object to help create WSGI responses. The objects map much of the specified behavior of HTTP, including header parsing and accessors for other standard parts of the environment.

Security Fix(es):

Impact

When WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python's urllib.parse, and joining it to the base URL. urlsplit (called internally by urljoin) however treats a // at the start of a string as a URI without a scheme, and then treats the next part as the hostname. urljoin will then use that hostname from the second part as the hostname replacing the original one from the request.

In a previous advisory https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3 an attempt to fix this was made by forcing the replacement of // with /%2f, however this did not take into account that since Python 3.10 urlsplit internally strips ASCII tab, carriage return, and newline characters from the string, so /\t/attacker.com gets turned into //attacker.com and the attacker is able to bypass the changes introduced in that previous advisory, thereby bringing back the problem that was attempted to be fixed.

>>> parse.urlparse("//attacker.com/some/path")
ParseResult(scheme='', netloc='attacker.com', path='/some/path', params='', query='', fragment='')

WebOb uses urljoin to take the request URI and join the redirect location to it, so assuming the request URI is https://example.org/ and the URL to redirect to is /\t/attacker.com/some/path/:

>>> parse.urljoin("https://example.org/", "/\t/attacker.com/some/path/")
'https://attacker.com/some/path/'

Which redirects from example.org where we want the user to stay to attacker.com.

Patches

This issue has been fixed in WebOb 1.8.10.

Workarounds

Any use of the Response class that includes a location can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g. http:// or https://) before assigning to Response.location.

References

  • https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3
  • CVE-2024-42353

Thanks

  • Caleb Brown of Google(CVE-2026-44889)
Database specific 
{
    "severity": "Medium"
}
References

Affected packages

openEuler:22.03-LTS-SP4 / python-webob

Package

Name
python-webob
Purl
pkg:rpm/openEuler/python-webob&distro=openEuler-22.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.7-4.oe2203sp4

Ecosystem specific 

{
    "src": [
        "python-webob-1.8.7-4.oe2203sp4.src.rpm"
    ],
    "noarch": [
        "python3-webob-1.8.7-4.oe2203sp4.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2679.json"

openEuler:24.03-LTS-SP1 / python-webob

Package

Name
python-webob
Purl
pkg:rpm/openEuler/python-webob&distro=openEuler-24.03-LTS-SP1

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.7-5.oe2403sp1

Ecosystem specific 

{
    "src": [
        "python-webob-1.8.7-5.oe2403sp1.src.rpm"
    ],
    "noarch": [
        "python3-webob-1.8.7-5.oe2403sp1.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2679.json"

openEuler:24.03-LTS-SP3 / python-webob

Package

Name
python-webob
Purl
pkg:rpm/openEuler/python-webob&distro=openEuler-24.03-LTS-SP3

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.7-5.oe2403sp3

Ecosystem specific 

{
    "src": [
        "python-webob-1.8.7-5.oe2403sp3.src.rpm"
    ],
    "noarch": [
        "python3-webob-1.8.7-5.oe2403sp3.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2679.json"

openEuler:20.03-LTS-SP4 / python-webob

Package

Name
python-webob
Purl
pkg:rpm/openEuler/python-webob&distro=openEuler-20.03-LTS-SP4

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.8.2-5.oe2003sp4

Ecosystem specific 

{
    "src": [
        "python-webob-1.8.2-5.oe2003sp4.src.rpm"
    ],
    "noarch": [
        "python2-webob-1.8.2-5.oe2003sp4.noarch.rpm",
        "python3-webob-1.8.2-5.oe2003sp4.noarch.rpm"
    ]
}

Database specific

source 
"https://repo.openeuler.org/security/data/osv/OESA-2026-2679.json"