# CVE-2026-49232: NLnet Labs Routinator denial of service via connection error handling

Source: https://junglewise.ai/threats/cve-2026-49232-nlnet-labs-routinator-denial-of-service-via-connection-error  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-06-08. Updated: 2026-06-08  
License: CC BY 4.0 with a link back

CVE-2026-49232 · Severity: info · CVSS 8.7 · Published 2026-06-08

Routinator, a tool used to verify Internet routing security, contains a flaw that causes the service to shut down unexpectedly when it encounters certain connection errors. An attacker can intentionally trigger this shutdown by flooding the service with a large number of connection requests, effectively knocking the system offline. This disruption can prevent the network from properly validating routing information, potentially impacting internet connectivity and security.

Technologies: [NLnet Labs Routinator](https://junglewise.ai/threats/technologies/routinator). Vendors: [NLnet Labs](https://junglewise.ai/threats/vendors/nlnet-labs).

## Quick answers

**Is CVE-2026-49232 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49232 being exploited in the wild.

**How severe is CVE-2026-49232?** Informational severity, with a CVSS score of 8.7, published 8 June 2026.

**Which products and versions are affected?** NLnet Labs Routinator up to and including 0.15.1.

**Is there a fix for CVE-2026-49232?** A patch was published on 2026-06-08: Fixed in version 0.15.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49232 attacked?** It is attacked over the network, in a hosted service.

**Am I affected by CVE-2026-49232?** Check whether you run NLnet Labs Routinator at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

Routinator (up to version 0.15.1) suffers from improper handling of exceptional conditions (CWE-755) within its HTTP and RTR server components. The application is designed to exit immediately upon encountering any error during the 'accept' phase of a connection, including recoverable resource exhaustion errors such as EMFILE (too many open files). A remote, unauthenticated attacker can exploit this by initiating a large number of concurrent connections to exhaust available file descriptors, forcing the Routinator process to terminate. This vulnerability is mitigated if the HTTP or RTR interfaces are not exposed to untrusted networks. The issue is resolved in version 0.15.2.

## Affected products

- NLnet Labs Routinator up to and including 0.15.1

## Timeline

- 2026-06-08: disclosed
- 2026-06-08: advisory
- 2026-06-08: patched: Fixed in version 0.15.2

## References

- [https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-49232.txt](https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-49232.txt)

## Related threats

- [Routinator AS range parsing memory exhaustion](https://junglewise.ai/threats/cve-2026-72758-when-parsing-an-as-range-in-routinator-if-the-maximum-value-of)
- [Routinator HTTP server denial of service via resource exhaustion](https://junglewise.ai/threats/cve-2026-72757-routinator-runs-out-of-open-connections-on-the-http-server-when)
- [Routinator denial of service from malformed rsync URIs](https://junglewise.ai/threats/cve-2026-72756-routinator-exits-when-an-rsync-uri-for-a-file-obtained-over-rrdp)
- [Routinator CRL parsing denial of service](https://junglewise.ai/threats/cve-2026-72754-when-routinator-encounters-a-crl-with-many-entries-it-may-hang-or)
- [Routinator improper RRDP delta entry validation](https://junglewise.ai/threats/cve-2026-72753-when-routinator-encounters-an-rrdp-notification-file-with-gaps-in)