Medium
python-webob — security advisory
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.
- Products
- python-webob
- Affected versions
- 1.4.1-1, 1.5.1-1, 1.5.1-1ubuntu0.1~esm2, 1:1.7.2-0ubuntu1, 1:1.7.3-0ubuntu1, 1:1.7.3-2fakesync1, 1:1.7.3-2ubuntu0.1~esm2, 1:1.8.10-1, 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, 1:1.8.6-1.1, 1:1.8.6-1.1ubuntu0.1, 1:1.8.6-1.1ubuntu0.2, 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, 1:1.8.9-1, 1:1.8.9-1ubuntu0.1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-54770
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:09 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-54770
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
python-webob
Fixed versions: Not specified
Complete source record
{
"id": "ed4c4e9a73e087c45166d953edf10a520d637f91ac93e18779a3949ddc534c3b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-54770",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-54770",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-54770",
"products": [
{
"name": {
"value": "python-webob",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.4.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.1-1ubuntu0.1~esm2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.7.2-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.7.3-0ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.7.3-2fakesync1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.7.3-2ubuntu0.1~esm2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.8.5-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.8.5-1build1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.8.5-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.8.5-2ubuntu0.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.8.5-2ubuntu0.1+esm1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.8.6-1.1",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.8.6-1.1ubuntu0.1",
"evidence": "/affected/3/versions"
},
{
"value": "1:1.8.6-1.1ubuntu0.2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.8.6-3",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.8.7-1",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.8.7-1ubuntu0.1.24.04.1",
"evidence": "/affected/4/versions"
},
{
"value": "1:1.8.7-1ubuntu0.1.24.04.2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.8.9-1",
"evidence": "/affected/5/versions"
},
{
"value": "1:1.8.10-1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "python-webob",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.8.9-1",
"evidence": "/affected/6/versions"
},
{
"value": "1:1.8.9-1ubuntu0.1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-54770",
"aliases": [
"UBUNTU-CVE-2026-54770"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=esm-infra-legacy%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
"1.4.1-1",
"1.5.1-1",
"1.5.1-1ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=esm-infra%2Fbionic",
"ecosystem": "Ubuntu:Pro:18.04:LTS"
},
"versions": [
"1:1.7.2-0ubuntu1",
"1:1.7.3-0ubuntu1",
"1:1.7.3-2fakesync1",
"1:1.7.3-2ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=esm-infra%2Ffocal",
"ecosystem": "Ubuntu:Pro:20.04:LTS"
},
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.5-2ubuntu0.1+esm1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"1:1.8.6-1.1",
"1:1.8.6-1.1ubuntu0.1",
"1:1.8.6-1.1ubuntu0.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.6-1.1ubuntu0.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.7-1ubuntu0.1.24.04.2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1:1.8.9-1",
"1:1.8.10-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.10-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-webob",
"purl": "pkg:deb/ubuntu/python-webob?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"1:1.8.9-1",
"1:1.8.9-1ubuntu0.1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-54770.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-webob",
"binary_version": "1:1.8.9-1ubuntu0.1"
}
]
}
}
],
"modified": "2026-10-17T13:00:26.997247058Z",
"provider": "osv",
"upstream": [
"CVE-2026-54770"
],
"references": [
"https://ubuntu.com/security/CVE-2026-54770",
"https://www.cve.org/CVERecord?id=CVE-2026-54770",
"https://github.com/Pylons/webob/security/advisories/GHSA-6hx8-3wjj-gr8g"
]
},
"related_cves": [
{
"value": "CVE-2026-54770",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 360557,
"published_at": "2026-08-20T17:18:00+00:00"
}