Critical
python-authlib — security advisory
Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.
- Products
- python-authlib
- Affected versions
- 0.15.4-1, 0.15.5-1, 0.15.5-1ubuntu0.1~esm1, 0.15.5-1ubuntu0.1~esm2, 1.2.1-1, 1.3.0-1, 1.3.0-1ubuntu0.1~esm1, 1.3.0-1ubuntu0.1~esm2, 1.6.0-1, 1.6.5-1, 1.6.6-1, 1.6.7-1, 1.6.7-1ubuntu0.1~esm1, 1.7.2-1, 1.7.2-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-104056
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:39 UTC · Revision 1
Source evidence
Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.
osv:UBUNTU-CVE-2026-104056
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
Complete source record
{
"id": "bbac1ec7212adfd66e1bb54219ecf6cef387383c6b42fe9fc987f2056053801f",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-104056",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-104056",
"summary": "Authlib version 1.7.2 and below contains a vulnerability where discovery JSON metadata is cached without validation or issuer-origin binding. This allows a poisoned discovery response to replace all endpoint values with attacker-controlled values rather than endpoint URLs that share the origin of the configured server metadata URL.",
"evidence": "osv:UBUNTU-CVE-2026-104056",
"products": [
{
"name": {
"value": "python-authlib",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.15.4-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.15.5-1",
"evidence": "/affected/0/versions"
},
{
"value": "0.15.5-1ubuntu0.1~esm1",
"evidence": "/affected/0/versions"
},
{
"value": "0.15.5-1ubuntu0.1~esm2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "python-authlib",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.2.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0-1ubuntu0.1~esm1",
"evidence": "/affected/1/versions"
},
{
"value": "1.3.0-1ubuntu0.1~esm2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "python-authlib",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.7-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.2-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.7.2-2",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "python-authlib",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1.6.0-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.5-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.6-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.7-1",
"evidence": "/affected/3/versions"
},
{
"value": "1.6.7-1ubuntu0.1~esm1",
"evidence": "/affected/3/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "UBUNTU-CVE-2026-104056",
"aliases": [
"UBUNTU-CVE-2026-104056"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib?arch=source&distro=esm-apps%2Fjammy",
"ecosystem": "Ubuntu:Pro:22.04:LTS"
},
"versions": [
"0.15.4-1",
"0.15.5-1",
"0.15.5-1ubuntu0.1~esm1",
"0.15.5-1ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104056.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "0.15.5-1ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib?arch=source&distro=esm-apps%2Fnoble",
"ecosystem": "Ubuntu:Pro:24.04:LTS"
},
"versions": [
"1.2.1-1",
"1.3.0-1",
"1.3.0-1ubuntu0.1~esm1",
"1.3.0-1ubuntu0.1~esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104056.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.3.0-1ubuntu0.1~esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"1.6.7-1",
"1.7.2-1",
"1.7.2-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104056.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.7.2-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib?arch=source&distro=esm-apps%2Fresolute",
"ecosystem": "Ubuntu:Pro:26.04:LTS"
},
"versions": [
"1.6.0-1",
"1.6.5-1",
"1.6.6-1",
"1.6.7-1",
"1.6.7-1ubuntu0.1~esm1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-104056.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.6.7-1ubuntu0.1~esm1"
}
]
}
}
],
"modified": "2026-10-17T12:58:42.827312491Z",
"provider": "osv",
"upstream": [
"CVE-2026-104056"
],
"references": [
"https://ubuntu.com/security/CVE-2026-104056",
"https://www.cve.org/CVERecord?id=CVE-2026-104056",
"https://uziii2208.github.io/post/cve-2026-104056/"
]
},
"related_cves": [
{
"value": "CVE-2026-104056",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358981,
"published_at": "2026-10-01T19:17:00+00:00"
}