TI-2026-83879 Aliases CVE-2026-109141 GHSA-9rcf-27j4-vxg2

Authorization bypass in NLnet Labs Krill exposes other CAs

LOW 38CWE-639Published 2026-11-02 · Updated 2026-11-02

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: High
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

NLnet Labs Krill is affected. A role limited to a list of CAs gets its full permissions on requests not tied to a CA, including the bulk CA import endpoint, due to an authorization bypass through a user-controlled key (CWE-639). A remote attacker with low privileges can add a child CA under any existing CA, give it that CA's resources, and create ROAs for them.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

The vulnerability gives a role that is restricted to a list of CAs (cas = [...]) its full permission set for every request that is not tied to a CA, including the bulk import endpoint POST /api/v1/bulk/cas/import. It adds a new child CA under any existing CA, gives the child any of that CA's resources, and creates the ROAs given in the request

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00276 20th percentileScored 2026-11-07

Fix Fixed Krill (NLnet Labs): 0.16.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
NLnet Labs	Krill	—	0.16.1	Patch available	CNA

Krill VendorNLnet Labs Affected — Fixed in 0.16.1 Patch available CNA

Remediation

Krill is fixed in version 0.16.1, so upgrade to that version or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Fix · CNA Krill (NLnet Labs) Fixed in 0.16.1

Timeline

2026-11-02 Threatist record created from CVE-2026-109141
2026-11-02 CISA SSVC decision points changed
2026-11-02 Priority changed: MEDIUM → LOW
2026-11-02 Alias added: GHSA-9rcf-27j4-vxg2

References

Advisory 1

https://www.nlnetlabs.nl/downloads/krill/CVE-2026-109141.txt

TI-2026-25690 Possible arbitrary code execution during DNSSEC validation CVSS 4.0CRITICAL 9.1
TI-2026-56302 Heap buffer overflow and possible Remote Code Execution when digesting DNSKEY CVSS 4.0CRITICAL 9.1
TI-2026-31146 Crash during DNSSEC validation of malicious content CVSS 4.0HIGH 8.7
TI-2026-31135 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options CVSS 4.0HIGH 8.7
TI-2026-36436 Routinator crashes on specifically crafted RRDP XML files CVSS 4.0HIGH 8.7
TI-2026-36433 Routinator exits when accepting an incoming HTTP or RTR connection fails CVSS 4.0HIGH 8.7

See all 96 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences