What is CVE-2026-109140?

CVE-2026-109140 is a high-severity vulnerability, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 8.4/10. Published 2026-11-02.

How severe is CVE-2026-109140?

High severity. CVSS v3 base score is 8.4 out of 10.

CVE-2026-109140

CVE-2026-109140

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.

Published 2026-11-02 · last modified 2026-11-02.

CVSS v3 metric

CVSS v3 base score 8.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-323 — Reusing a Nonce, Key Pair in Encryption

References

www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt (vendor-advisory)

Frequently asked questions

What is CVE-2026-109140?: CVE-2026-109140 is a high-severity vulnerability, classified under Reusing a Nonce, Key Pair in Encryption. CVSS score: 8.4/10. Published 2026-11-02.
How severe is CVE-2026-109140?: High severity. CVSS v3 base score is 8.4 out of 10.