# CVE-2026-72754: Routinator CRL parsing denial of service

Source: https://junglewise.ai/threats/cve-2026-72754-when-routinator-encounters-a-crl-with-many-entries-it-may-hang-or  
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-2026-72754 · Severity: high · CVSS 7.5 · Published 2026-10-26

Routinator is a RPKI relying party software that validates routing security data. A malicious or malformed Certificate Revocation List (CRL) file can cause Routinator to hang, exhaust memory, or crash, disrupting RPKI validation services that organizations depend on for secure BGP routing.

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

## Quick answers

**Is CVE-2026-72754 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-72754 being exploited in the wild.

**How severe is CVE-2026-72754?** High severity, with a CVSS score of 7.5, published 26 October 2026.

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

**Is there a fix for CVE-2026-72754?** Yes: fixed in Routinator 0.15.3. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-72754 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-72754?** 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

## Technical details

Routinator improperly handles CRL files with excessive entries or incorrect encoding, leading to denial of service through resource exhaustion (memory, CPU) or unhandled exceptions. The vulnerability requires an attacker to provide a malformed CRL file to an instance of Routinator, typically via network retrieval of RPKI data. An exploit results in service unavailability.

## Affected products

- NLnet Labs Routinator up to and including 0.15.2

## Timeline

- 2026-10-26: disclosed

## References

- [https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72754.txt](https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72754.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 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)