# CVE-2026-72758: Routinator AS range parsing memory exhaustion

Source: https://junglewise.ai/threats/cve-2026-72758-when-parsing-an-as-range-in-routinator-if-the-maximum-value-of  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-72758 · Severity: high · CVSS 7.5 · Published 2026-10-26

Routinator is software that validates Internet routing data. When processing a malformed AS (Autonomous System) number range where the maximum is smaller than the minimum, the software enters an infinite loop and consumes all available memory, causing a denial of service. An attacker can trigger this by providing crafted routing data.

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

## Quick answers

**Is CVE-2026-72758 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-72758 being exploited in the wild.

**How severe is CVE-2026-72758?** High severity, with a CVSS score of 7.5, published 26 October 2026.

**Which products and versions are affected?** NLnet Labs Routinator up to 0.15.2.

**Is there a fix for CVE-2026-72758?** Yes: fixed in Routinator 0.15.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-72758 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-72758?** 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.

## How to fix

- Fixed in Routinator 0.15.3 or later

## Technical details

The vulnerability exists in Routinator's AS range parsing logic, where an inverted range (max < min) causes the iteration to never terminate, leading to unbounded memory allocation. This is triggered during parsing of RPKI or similar routing data, requiring network access to provide malicious input or control over routing object data sources. An attacker can achieve denial of service by exhausting the target system's memory.

## Affected products

- NLnet Labs Routinator up to 0.15.2

## Timeline

- 2026-10-26: disclosed

## References

- [https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72756.txt](https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72756.txt)

## Related threats

- [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)
- [NLnet Labs Routinator denial of service via repeated JSON requests](https://junglewise.ai/threats/cve-2026-72752-routinator-runs-out-of-memory-when-the-json-output-is-requested)