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CVE-2026-94613

authentik: Denial of Service via Document Type Declarations in SAML Messages

CVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-94613

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-94613

Published

authentik

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "goauthentik",
                    "product": "authentik",
                    "versions": [
                        {
                            "version": "< 2026.2.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2026.5.0, < 2026.5.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2026.8.0, < 2026.8.2",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON