UBUNTU-CVE-2026-114620 (CVE-2026-114620)
Vulnerability from osv_ubuntu – Published: 2026-10-22 22:18 – Updated: 2026-10-28 17:50 – Source websiteAuthlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib's RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "0.15.5-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib@0.15.5-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.15.4-1",
"0.15.5-1",
"0.15.5-1ubuntu0.1~esm1",
"0.15.5-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.3.0-1ubuntu0.1~esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib@1.3.0-1ubuntu0.1~esm2?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.2.1-1",
"1.3.0-1",
"1.3.0-1ubuntu0.1~esm1",
"1.3.0-1ubuntu0.1~esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.7.2-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib@1.7.2-2?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6.7-1",
"1.7.2-1",
"1.7.2-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "python3-authlib",
"binary_version": "1.6.7-1ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:26.04:LTS",
"name": "python-authlib",
"purl": "pkg:deb/ubuntu/python-authlib@1.6.7-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.6.0-1",
"1.6.5-1",
"1.6.6-1",
"1.6.7-1",
"1.6.7-1ubuntu0.1~esm1"
]
}
],
"aliases": [],
"details": "Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to 1.9.0, Authlib\u0027s RFC 9101 JWTAuthenticationRequest passes the unauthenticated, client-controlled request_uri parameter to the abstract get_request_object() hook before applying a destination or registration policy; the hook itself performs no network request, while the documentation demonstrates an unrestricted HTTP fetch. In deployments whose integrator implements that hook as an unrestricted outbound fetch, a remote attacker who knows a valid public client identifier can make the authorization server request internal, link-local, or otherwise unintended URLs and can distinguish fetch outcomes through different error responses and timing. Deployments whose custom hook already applies a secure allowlist, destination controls, and retrieval limits are not affected. The JWTAuthenticationRequest implementation in authlib/oauth2/rfc9101/authorization_server.py forwards request_uri to get_request_object() before an application-approved retrieval policy accepts the destination. This issue is fixed in version 1.9.0.",
"id": "UBUNTU-CVE-2026-114620",
"modified": "2026-10-28T17:50:37Z",
"published": "2026-10-22T22:18:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-114620"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-114620"
},
{
"type": "REPORT",
"url": "https://github.com/authlib/authlib/commit/6563f6f7a8c2f71d2f85ee7511d72a4fbae3acc0"
},
{
"type": "REPORT",
"url": "https://github.com/authlib/authlib/commit/891e3f10ae5989176211f8be35dcc7cd40aa92c6"
},
{
"type": "REPORT",
"url": "https://github.com/authlib/authlib/pull/949"
},
{
"type": "REPORT",
"url": "https://github.com/authlib/authlib/releases/tag/v1.9.0"
},
{
"type": "REPORT",
"url": "https://github.com/authlib/authlib/security/advisories/GHSA-x4rv-c3wx-4cr8"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-114620"
]
}
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