---
id: CVE-2026-109142
title: >-
  Krill treats a "local parent" as already-authenticated, letting a CA operator
  act as any child of any CA on the same server
summary: >-
  When a CA's parent lives on the same Krill server: instead of building and
  verifying a signed CMS message, it runs the RFC 6492 provisioning exchange
  in-process and trusts the child identity (child_handle) that the caller put in
  the pare…
severity: high
cvss: 8.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-639
vendor: NLnet Labs
product: Krill
affected:
  - Krill (all versions)
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-11-02T16:10:47.154411Z'
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T16:10:56.242Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109142'
references:
  - url: 'https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109142.txt'
tags:
  - cve.org
epss: 0.00276
epssPercentile: 0.20152
ingestedAt: '2026-11-05T19:30:42.704Z'
---

## Overview

When a CA's parent lives on the same Krill server: instead of building and verifying a signed CMS message, it runs the RFC 6492 provisioning exchange in-process and trusts the child identity (child_handle) that the caller put in the parent contact. Nothing checks that this child identity actually belongs to the CA making the request.

## Affected

- `Krill (all versions)`

## Remediation

This issue is fixed in 0.16.1 and all later versions.