---
id: "CVE-2026-124000"
page: "https://infrastack.ai/live/CVE-2026-124000"
kind: "vulnerability"
aliases: ["CVE-2026-124000"]
title: "NASA ION-DTN amsd: crafted messages overflow heap and crash configuration server"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["amsd", "infrastructure", "ion-dtn", "self-hosted", "space-networking"]
not_affected_if: ["amsd-not-running", "no-ams-peers"]
published_at: "2026-11-09T19:16:47+00:00"
first_seen_at: "2026-11-09T19:28:14+00:00"
updated_at: "2026-11-09T19:30:24+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124000", "first_seen_at": "2026-11-09T19:28:14+00:00"}]
exploit_sources: []
---

# NASA ION-DTN amsd: crafted messages overflow heap and crash configuration server

Link for people: https://infrastack.ai/live/CVE-2026-124000 (this .md is for agents)

NASA JPL ION-DTN, a delay-tolerant networking suite, has a heap under-allocation in its Asynchronous Message Service daemon (amsd) affecting versions 2.1.0 through 4.2.0. A rogue or misconfigured peer sending unauthenticated Meta-AMS configuration messages can trigger an out-of-bounds write that crashes the Configuration Server thread, causing denial of service and possibly destabilizing later shared-memory allocations.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed ION-DTN version against the affected range `2.1.0` through `4.2.0`
- Check whether `amsd` is running and reachable from peers that are not fully trusted, unknown if the sources say more

## Fix

- Move ION-DTN past `4.2.0`; the exact fixed version is unknown from the sources given

## Timeline

- 2026-11-09T19:28:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124000

## Documents

- [advisory] Vendor advisory: github.com https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-h28r-fr59-c79c
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/ion-dtn-heap-buffer-under-allocation-dos-in-amsd
- [fix] Release notes: github.com https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2

## From the sources

NASA JPL ION-DTN 2.1.0 through 4.2.0 contains a heap buffer under-allocation vulnerability in the Asynchronous Message Service daemon (amsd) that allows a rogue or misconfigured peer to trigger an out-of-bounds write by sending crafted Meta-AMS (MAMS) configuration management messages that are processed without cryptographic authentication. Attackers can exploit the insufficient buffer size calculation for the internal state-event object to crash the active Configuration Server thread, causing a denial of service and potentially destabilizing subsequent shared-memory allocations in amsd.

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