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CVE-2026-71317

CVE-2026-71317 · Lemur: Sub-CA creation never checks `AuthorityPermission` on the parent authority

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/authorities with type=subca did not require AuthorityPermission on the parent authority when ADMIN_ONLY_AUTHORITY_CREATION was false. AssociatedAuthoritySchema resolved the caller-supplied parent and passed it through authority creation to cryptography-issuer, which used the parent authority_certificate.private_key to sign a new intermediate. Any authenticated non-read-only user in that supported configuration could chain a sub-CA to an internal root for which the user held no role. The resulting intermediate could issue trusted certificates and its private key could be used outside Lemur, bypassing normal issuance controls. The fix checks AuthorityPermission on every supplied parent before invoking the issuer. This issue is fixed in version 1.9.3.

CVSS 6.5 · Medium · EPSS 0.1% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • lemur

    Versions
    • < 1.9.3: Affected

    No fix published

  • lemur PyPI

    Versions
    • 0.11.0
    • 0.2.1
    • 0.8.0
    • 0.8.1
    • 0.9.0
    • 1.0.0
    • 1.1.0
    • 1.2.0
    • 1.3.1
    • 1.3.2
    • 1.4.0
    • 1.5.0
    • 1.6.0
    • 1.7.0
    • 1.8.0
    • 1.8.1
    • 1.8.2
    • 1.9.0
    • 1.9.1
    • 1.9.2
    Affected ranges
    • ECOSYSTEM: < 1.9.3

    Update to 1.9.3

Original sources

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