NLnet Labs NSD up to 4.14.2 Certificate missing authentication

CVSS Meta Temp Score
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CTI Interest Score
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3.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in NLnet Labs NSD up to 4.14.2. The affected element is an unknown function of the component Certificate Handler. Such manipulation leads to missing authentication. This vulnerability is listed as CVE-2026-12490. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in NLnet Labs NSD up to 4.14.2. Affected by this issue is an unknown functionality of the component Certificate Handler. The manipulation with an unknown input leads to a missing authentication vulnerability. Using CWE to declare the problem leads to CWE-306. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources. Impacted is confidentiality. CVE summarizes:

When a provide-xfr is given with a tls-auth-name, a secondary requesting a transfer should provide a client certificate with that name. However, no client certificate is needed when the request comes in over TLS over the regular tls-port (and not the tls-auth-port) or over over TCP over the regular port, when the other conditions of the provide-xfr rule match.

The weakness was presented by Qifan Zhang. The advisory is shared for download at nlnetlabs.nl. This vulnerability is handled as CVE-2026-12490 since 06/17/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 322955 (Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : NSD vulnerabilities (USN-8474-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.14.3 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (322955) and EUVD (EUVD-2026-39185). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.6

VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Missing authentication
CWE: CWE-306 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 322955
Nessus Name: Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : NSD vulnerabilities (USN-8474-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: NSD 4.14.3

Timelineinfo

06/17/2026 CVE reserved
06/25/2026 +8 days Advisory disclosed
06/25/2026 +0 days VulDB entry created
06/26/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: nlnetlabs.nl
Researcher: Qifan Zhang
Status: Confirmed

CVE: CVE-2026-12490 (🔒)
GCVE (CVE): GCVE-0-2026-12490
GCVE (VulDB): GCVE-100-373808
EUVD: 🔒

Entryinfo

Created: 06/25/2026 12:28
Updated: 06/26/2026 22:52
Changes: 06/25/2026 12:28 (69), 06/25/2026 16:23 (1), 06/26/2026 22:52 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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