CVE-2026-109140

HIGH 8.4

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

CVSS Score

8.4

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-323
Vendor	nlnet labs
Product	krill
Published	Nov 2, 2026
Last Updated	Nov 2, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

NLnet Labs / Krill

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

nlnetlabs.nl: https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt

Credits

Anthropic and Ada Logics, Aymen Benlamari