CVE-2026-109142

High

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.

SeverityHigh

CVSS8.4

Exploit probability—

ProductKrill

PublishedNov 2, 2026

First seenNov 4, 2026

Weakness typeCWE-639Authorization bypass through user-controlled key

How to fix

Vendor advisories

nlnetlabs.nl/downloads/krill/CVE-2026-109142.txt

Affected products

Product	Affected versions	Fixed in
NLnet Labs Krill	No range specified	—

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