# CVE-2026-109141: Krill authorization bypass in bulk CA import

Source: https://junglewise.ai/threats/cve-2026-109141-the-vulnerability-gives-a-role-that-is-restricted-to-a-list-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-02. Updated: 2026-11-02  
License: CC BY 4.0 with a link back

CVE-2026-109141 · Severity: high · CVSS 8.4 · Published 2026-11-02

Krill is a management system for RPKI (Route Origin Authorizations), which certifies that IP address holders are authorized to announce their prefixes. A vulnerability allows users restricted to managing a single CA to bypass authorization checks and add child CAs under any other CA, and publish route authorizations for arbitrary prefixes. This could allow an attacker to hijack IP prefixes and redirect internet traffic.

Technologies: [NLnet Labs Krill](https://junglewise.ai/threats/technologies/krill). Vendors: [NLnet Labs](https://junglewise.ai/threats/vendors/nlnet-labs).

## Quick answers

**Is CVE-2026-109141 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-109141 being exploited in the wild.

**How severe is CVE-2026-109141?** High severity, with a CVSS score of 8.4, published 2 November 2026.

**Which products and versions are affected?** NLnet Labs Krill up to and including 0.16.0.

**Is there a fix for CVE-2026-109141?** Yes: fixed in Krill 0.16.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-109141 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-109141?** Check whether you run NLnet Labs Krill at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in Krill 0.16.1

## Technical details

The vulnerability exists in the bulk import endpoint POST /api/v1/bulk/cas/import, which applies full permissions to CA-restricted roles for requests not explicitly tied to a CA. An unauthenticated or low-privileged attacker can add a child CA under any existing CA, inherit that CA's resources, and create ROAs (Route Origin Authorizations) for arbitrary IP prefixes via the bulk import API.

## Affected products

- NLnet Labs Krill up to and including 0.16.0

## Timeline

- 2026-11-02: disclosed

## References

- [https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109141.txt](https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109141.txt)

## Related threats

- [NLnet Labs Krill parent CA authentication bypass](https://junglewise.ai/threats/cve-2026-109142-when-a-ca-s-parent-lives-on-the-same-krill-server-instead-of)
- [NLnet Labs Krill session token forgery via nonce reuse](https://junglewise.ai/threats/cve-2026-109140-the-vulnerability-is-that-krill-encrypts-every-login-session)