NLnet Labs Routinator path traversal

Summaryinfo

A vulnerability, which was classified as critical, has been found in NLnet Labs Routinator. This affects an unknown part. Performing a manipulation results in path traversal. This vulnerability is known as CVE-2026-49233. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in NLnet Labs Routinator (affected version unknown). It has been classified as critical. This affects an unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. CWE is classifying the issue as CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. This is going to have an impact on integrity, and availability. The summary by CVE is:

Routinator does not properly check the module component of rsync URIs, which are used to create the file system paths for the Routinator cache. This allows for path traversal by having a module name containing .., potentially providing an attacker access to the entire Routinator rsync cache.

It is possible to read the advisory at nlnetlabs.nl. This vulnerability is uniquely identified as CVE-2026-49233 since 05/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 06/08/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-35063). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

• NLnet Labs

Name

• Routinator

CPE 2.3info

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CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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