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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

Quick assessment

Affected
NLnet Labs Krill
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

该漏洞在于：Krill 使用一个在每次重启时重置为 0 的计数器来生成 nonce，并以此对每个登录会话令牌进行加密。因此，每次重启后，相同的（密钥，nonce）对会被重复使用。

CVSS 8.4 · High EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
NLnet Labs Krill 0.16.1< * unaffected
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I. Basic Information for CVE-2026-109140

Vulnerability Information
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Vulnerability Title
Krill login-session tokens reuse their encryption nonce across restarts, so any user who can log in can forge an "admin" token
Source: CVE Program / CVE List V5
Vulnerability Description
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 Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
NLnet Labs Krill 0.16.1 ~ * -

II. Public POCs for CVE-2026-109140

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III. Intelligence Information for CVE-2026-109140

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Other References for CVE-2026-109140 (1)

Same Patch Batch · NLnet Labs · 2026-11-02 · 3 CVEs total

CVE-2026-109142 8.4 HIGH Krill treats a "local parent" as already-authenticated, letting a CA operator act as any c
CVE-2026-109141 8.4 HIGH Krill users restricted to one CA can make any other CA delegate its prefixes and publish R

IV. Related Vulnerabilities

Same product: Krill
Same vendor: NLnet Labs
Same weakness: CWE-323