authentik: Denial of Service via Document Type Declarations in SAML Messages
authentik is an open-source identity provider. Prior to 2026.2.7, 2026.5.7, and 2026.8.2, an unauthenticated attacker can submit a malformed SAML message to an authentik deployment using SAML in either the identity-provider or SAML source role. The message can stop the worker handling /application/saml/* or /source/saml/*, causing the requests assigned to that worker to fail. Worker process termination and automatic restart do not destroy database-backed sessions, but continued malicious messages can cause a sustained share of legitimate traffic to fail. Other protocol implementations are not affected. This issue is fixed in versions 2026.2.7, 2026.5.7, and 2026.8.2.
BIT-authentik-2026-94613
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:BIT-authentik-2026-94613
authentik
Source reference: /affected/0/package/name
- Affected versions
- Not stated in this record
- Fixed versions
- 2026.2.7
Source reference:
/affected/0/ranges2026.5.7Source reference:
/affected/0/ranges2026.8.2Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "SEMVER",
"events": [
{
"introduced": "0"
},
{
"fixed": "2026.2.7"
},
{
"introduced": "2026.5.0"
},
{
"fixed": "2026.5.7"
},
{
"introduced": "2026.8.0"
},
{
"fixed": "2026.8.2"
}
]
}
],
"package": {
"name": "authentik",
"purl": "pkg:bitnami/authentik",
"ecosystem": "Bitnami"
},
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"database_specific": {
"source": "https://github.com/bitnami/vulndb/tree/main/data/authentik/BIT-authentik-2026-94613.json"
}
}
]- Related CVEs
- CVE-2026-94613
Source reference:
/aliases
Publisher severity
high
Source reference: /database_specific/severity
- Event
- #59595 · Revision 1
- Added to Heist Feed
- Publisher date