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

Type: advisorySource: OSV1 source record

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.

Announced Source revision 1
Original source ↗

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/ranges

2026.5.7

Source reference: /affected/0/ranges

2026.8.2

Source 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

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-94613 · High

authentik

Event
#59595 · Revision 1
Added to Heist Feed
Publisher date
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