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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-109140
StatePUBLISHED
AssignerNLnet Labs
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-02 16:17:26 UTC
Updated2026-11-02 19:35:33 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 8.4 HIGH from [email protected]

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

Problem Types: CWE-323 | CWE-323 CWE-323 Reusing a Nonce, Key Pair in Encryption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.4HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
3.1CNACVSS8.4HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA NLnet Labs Krill unaffected 0.16.1 * semver Not specified

References

ReferenceSourceLinkTags
www.nlnetlabs.nl/downloads/krill/CVE-2026-109140.txt [email protected] www.nlnetlabs.nl
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Anthropic and Ada Logics, Aymen Benlamari (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-10-03T00:00:00.000ZIssue reported
CNA2026-11-02T00:00:00.000ZFixes released

Solutions

CNA: This issue is fixed in 0.16.1 and all later versions.

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