---
title: "CVE-2026-75584: ION-DTN - Denial of Service"
description: "ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability caused by improper validation of zero-length payload in BPv7 bundles in canonicalizePayloadBlock(), letting unauthenticated remote attackers crash the process, exploit requires sending a crafted bundle with zero-length payload."
url: https://panop.io/threat-heartbeat/CVE-2026-75584/
---

# CVE-2026-75584 ION-DTN - Denial of Service

ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability caused by improper validation of zero-length payload in BPv7 bundles in canonicalizePayloadBlock(), letting unauthenticated remote attackers crash the process, exploit requires sending a crafted bundle with zero-length payload.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.61% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-75584)

## Details

Type

Denial of Service

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Published

10 September 2026

Updated

15 October 2026

Weakness

[CWE-617](https://cwe.mitre.org/data/definitions/617.html)

## Vendor fix

Update to version 4.2.1-a.1 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-75584](https://nvd.nist.gov/vuln/detail/CVE-2026-75584)
- [https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-9vgc-2r6g-6qwf](https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-9vgc-2r6g-6qwf)
- [https://www.vulncheck.com/advisories/ion-dtn-a-1-denial-of-service-via-canonicalizepayloadblock-assertion](https://www.vulncheck.com/advisories/ion-dtn-a-1-denial-of-service-via-canonicalizepayloadblock-assertion)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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