---
title: "GHSA-9vp8-3hmv-8fgh: stigmem-node's federation peer registration lacked explicit out-of-band approval"
url: https://erroneo.us/security/ghsa/GHSA-9vp8-3hmv-8fgh/
description: "GHSA-9vp8-3hmv-8fgh (critical, PyPI): stigmem-node's federation peer registration lacked explicit out-of-band approval. Impact Federation peer registration…"
type: advisory
section: "Security Digest"
date_published: 2026-05-29
date_modified: 2026-05-29
publisher: erroneo.us
author: erroneo.us Security Desk
ghsa: "GHSA-9vp8-3hmv-8fgh"
license: All rights reserved. Quote with attribution and a link.
---

# GHSA-9vp8-3hmv-8fgh: stigmem-node's federation peer registration lacked explicit out-of-band approval

## Affected packages

- PyPI `stigmem-node` < 0.9.0a2 → fixed: 0.9.0a2

## Details

Impact Federation peer registration accepted peer key material during registration without a separate administrator approval step based on an out-of-band fingerprint check. Impacted deployments are nodes that accept federation peer registration across a network where initial registration could be intercepted or misdirected. Patches Patched in 0.9.0a2. Peer registration now uses a pending approval flow, and peer tokens are not accepted until an administrator approves the peer using the expected fingerprint. Workarounds Before upgrading, restrict peer registration endpoints to trusted administrative networks and verify peer public-key fingerprints out of band before allowing federation traffic. Upgrade Upgrade to the patched release: If developers install through the Stigmem meta-package instead, they should use the matching extra for deployments, for example: Resources - Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2 - Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35 - Security policy and posture: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md

## Sources

- [GitHub Advisory GHSA-9vp8-3hmv-8fgh](https://github.com/advisories/GHSA-9vp8-3hmv-8fgh)
- [github.com](https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-9vp8-3hmv-8fgh)
- [github.com](https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35)
- [github.com](https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md)
- [github.com](https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2)

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Source page: https://erroneo.us/security/ghsa/GHSA-9vp8-3hmv-8fgh/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt