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
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2026-109140- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L - Weakness
- CWE-323
- Updated
- 2026-11-02
EUVDEUVD-2026-115255
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.
- Record
EUVD-2026-115255- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-7mpx-94gm-vm7j
The vulnerability is that Krill encrypts every login-session token with a nonce built from a...
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.
- Record
GHSA-7mpx-94gm-vm7j- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L - Weakness
- CWE-323
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2026-109140- CVSS 3.1
- 8.4 High
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L - Weakness
- CWE-323
- Updated
- 2026-11-03
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD, NVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-109140 is a high vulnerability (CVSS 8.4) in Nlnet Labs Krill, published November 2, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.31%, the 23rd percentile. No source names a fixed version.