CVE-2026-109142 Details
Description
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.
A vulnerability in Krill versions prior to and including 0.16.0 allows a Certificate Authority (CA) operator to impersonate any child of a CA on the same server. When a CA's parent is on the same Krill server, the system bypasses the creation and verification of a signed CMS message. Instead, it directly executes the RFC 6492 provisioning exchange and automatically trusts the child identity provided by the caller, without verifying its legitimacy. This flaw arises because there is no validation to ensure that the specified child identity actually belongs to the requesting CA.
Users can upgrade to Krill version 0.16.1 or later to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Nov 2, 2026CISA-ADP
Assessed Nov 2, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109142.txt | [email protected] | AdvisoryRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| NLnet Labs Krill | <= 0.16.0 (semver) |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 2, 2026 | CVE Modified | CISA-ADP |
| Nov 2, 2026 | New CVE Received | [email protected] |