CVE-2026-109140: Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an "admin" token

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 10 Nov 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.3%

EPSS score, percentile 24.1 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

8.4 High

CVSS v3.1 base score, given by the CNA

What should I do?

This issue is fixed in 0.16.1 and all later versions.Solution from the CVE record.

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (1)

Which versions are affected?

Unaffected 0.16.1

Versions by product

Source: CISA KEV 2026.11.10, as of 10 Nov 2026; FIRST EPSS, as of 12 Nov 2026; CVE List, as of 12 Nov 2026. About the data.

Description

Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an "admin" token

The vulnerability is that Krill encrypts every login-session token with a nonce built from a counter that is reset to 0 on every Krill restart, so the same (key, nonce) pair is used again after each restart.

Source: CVE List, as of 12 Nov 2026. About the data.

What to do

Advisories and patches

• nlnetlabs.nl (Vendor advisory)

This summary is based on the CVE record as of 12 Nov 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 12 Nov 2026. About the data.

Timeline