---
id: CVE-2026-71417
title: Lemur manages TLS certificate creation
summary: >-
  Lemur manages TLS certificate creation. Prior to 1.9.3, POST
  /api/1/certificates/upload allowed a non-read-only user to create a duplicate
  row using another certificate body, authority_id, serial, or external_id
  without requiring permiss…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H'
cwe:
  - CWE-639
vendor: lemur
product: lemur
affected:
  - lemur <= 1.9.2
patched:
  - lemur 1.9.3
published: '2026-08-18'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T21:02:26.047'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71417'
references:
  - url: >-
      https://github.com/Netflix/lemur/commit/851389ae737a6d6bf16c1f9ca64a2ce56c1cc5c6
    label: security-advisories@github.com
  - url: 'https://github.com/Netflix/lemur/releases/tag/v1.9.3'
    label: security-advisories@github.com
  - url: 'https://github.com/Netflix/lemur/security/advisories/GHSA-pxmc-2ffp-8j67'
    label: security-advisories@github.com
  - url: 'https://github.com/Netflix/lemur/security/advisories/GHSA-pxmc-2ffp-8j67'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-pxmc-2ffp-8j67'
tags:
  - nvd
  - ghsa
  - pip
epss: 0.00105
epssPercentile: 0.0097
aliases:
  - GHSA-pxmc-2ffp-8j67
ecosystem: pip
ingestedAt: '2026-08-18T21:22:59.580Z'
---

## Overview

Lemur manages TLS certificate creation. Prior to 1.9.3, POST /api/1/certificates/upload allowed a non-read-only user to create a duplicate row using another certificate body, authority_id, serial, or external_id without requiring permission on the underlying authority. PUT /api/1/certificates//revoke authorized the caller against only the selected Lemur row, so the creator of the duplicate bypassed CertificatePermission. The duplicate had no cert.endpoints, which also bypassed the safeguard that prevents revocation of deployed certificates. Issuer plugins then revoked the real CA-side certificate using certificate.body or external_id under the stored authority credentials. An attacker could therefore revoke arbitrary managed certificates and cause fleet-wide TLS denial of service. The fix rejects duplicate authority_id and serial identities, requires authority access on upload, and checks every matching row during revocation. This issue is fixed in version 1.9.3.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-71417)

Affected packages:

- `lemur <= 1.9.2`

Patched in:

- `lemur 1.9.3`

Source: https://github.com/advisories/GHSA-pxmc-2ffp-8j67