Critical
DEBIAN-CVE-2026-104056
Type: advisorySources: OSV
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
- 1.2.0-1, 1.2.0-1+deb12u1, 1.2.0-1+deb12u2, 1.2.1-1, 1.3.0-1, 1.3.0-2, 1.3.0-3, 1.3.1-1, 1.3.2-1, 1.3.2-2, 1.4.0-1, 1.4.1-1, 1.5.0-1, 1.5.1-1, 1.5.2-1, 1.6.0-1, 1.6.0-1+deb13u1, 1.6.1-1, 1.6.3-1, 1.6.4-1, 1.6.5-1, 1.6.6-1, 1.6.7-1, 1.6.8-1, 1.6.9-1, 1.7.0-1, 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
- 27 Oct 2026, 08:07 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:DEBIAN-CVE-2026-104056
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
python-authlib
Fixed versions: Not specified
Complete source record
{
"id": "1da99c487a26115a73822474933413a1695c94109c4aa03438bf8ca1dcea5b78",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-104056",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-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:DEBIAN-CVE-2026-104056",
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{
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{
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{
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{
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{
"value": "1.6.8-1",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-104056",
"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
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],
"affected": [
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"package": {
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"purl": "pkg:deb/debian/python-authlib?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
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"1.2.0-1+deb12u1",
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"database_specific": {
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"1.7.2-2"
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},
"ecosystem_specific": {
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},
{
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"package": {
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"purl": "pkg:deb/debian/python-authlib?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.6.0-1",
"1.6.1-1",
"1.6.3-1",
"1.6.4-1",
"1.6.5-1",
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"1.6.7-1",
"1.6.8-1",
"1.6.9-1",
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},
"ecosystem_specific": {
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}
}
],
"modified": "2026-10-06T10:00:20.226907634Z",
"provider": "osv",
"upstream": [
"CVE-2026-104056"
],
"references": [
"https://security-tracker.debian.org/tracker/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": 88510,
"published_at": "2026-10-01T19:17:19.033+00:00"
}