UBUNTU-CVE-2026-54770 (CVE-2026-54770)
Vulnerability from osv_ubuntu – Published: 2026-08-20 17:18 – Updated: 2026-09-23 23:31 – Source website
VLAI
Details
WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith("//") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application's redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.
Severity
6.1 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-webob",
"binary_version": "1.5.1-1ubuntu0.1~esm2"
},
{
"binary_name": "python3-webob",
"binary_version": "1.5.1-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1.5.1-1ubuntu0.1~esm2?arch=source\u0026distro=esm-infra-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.1-1",
"1.5.1-1",
"1.5.1-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python-webob",
"binary_version": "1:1.7.3-2ubuntu0.1~esm2"
},
{
"binary_name": "python3-webob",
"binary_version": "1:1.7.3-2ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1:1.7.3-2ubuntu0.1~esm2?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.7.2-0ubuntu1",
"1:1.7.3-0ubuntu1",
"1:1.7.3-2fakesync1",
"1:1.7.3-2ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.5-2ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1:1.8.5-2ubuntu0.1+esm1?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.8.5-1",
"1:1.8.5-1build1",
"1:1.8.5-2",
"1:1.8.5-2ubuntu0.1",
"1:1.8.5-2ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.6-1.1ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1:1.8.6-1.1ubuntu0.2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.8.6-1.1",
"1:1.8.6-1.1ubuntu0.1",
"1:1.8.6-1.1ubuntu0.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.7-1ubuntu0.1.24.04.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1:1.8.7-1ubuntu0.1.24.04.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.8.6-3",
"1:1.8.7-1",
"1:1.8.7-1ubuntu0.1.24.04.1",
"1:1.8.7-1ubuntu0.1.24.04.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.9-1ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob@1:1.8.9-1ubuntu0.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1:1.8.9-1",
"1:1.8.9-1ubuntu0.1"
]
}
],
"aliases": [],
"details": "WebOb provides objects for HTTP requests and responses. Prior to 1.8.11, Response._make_location_absolute() in src/webob/response.py checks a Location value for a URI scheme or leading double slash before urllib.parse.urljoin() strips leading C0 control characters and spaces. An attacker-controlled value such as a space followed by a protocol-relative or absolute URL can therefore bypass SCHEME_RE and startswith(\"//\") checks and be normalized to an off-host redirect. Request.relative_url() and webob.exc._HTTPMove subclasses, including HTTPFound, are also affected because they use the same unsafe URL joining behavior or bypass the earlier normalization path. An unauthenticated attacker who can influence an application\u0027s redirect target can send users to an attacker-controlled host for phishing or OAuth and SSO token theft, but exploitation requires the user to follow the redirect. This issue is fixed in version 1.8.11.",
"id": "UBUNTU-CVE-2026-54770",
"modified": "2026-09-23T23:31:22Z",
"published": "2026-08-20T17:18:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-54770"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-54770"
},
{
"type": "REPORT",
"url": "https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-54770"
]
}
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Sightings
| Author | Source | Type | Date | Other |
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Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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