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.
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-94613US | — | — | ||
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… | ||||
references
External citations — patches, advisories, analysis.
- https://docs.goauthentik.io/releases/2026.2#fixed-in-202627WEB
- https://docs.goauthentik.io/releases/2026.5#fixed-in-202657WEB
- https://docs.goauthentik.io/releases/2026.8#fixed-in-202682WEB
- https://github.com/goauthentik/authentik/commit/03d19d63b8d8dd7bc3de7cf6e57c6df341a9fc86WEB
- https://github.com/goauthentik/authentik/commit/4cf2f803b1c2ef38c224eead375fd057a10ee8acWEB
- https://github.com/goauthentik/authentik/commit/732adad26bb97361b6bf25ef138df5c16471ba1fWEB
- https://github.com/goauthentik/authentik/commit/a029f5372295bfeb1e334855f78601681cdc9a2dWEB
- https://github.com/goauthentik/authentik/pull/25959WEB
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