---
id: CVE-2026-75584
title: >-
  ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that
  allows unauthenticated remote attackers to crash the ION process by sending a
  BPv7 bundle with a zero-length payload
summary: >-
  ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that
  allows unauthenticated remote attackers to crash the ION process by sending a
  BPv7 bundle with a zero-length payload. The canonicalizePayloadBlock()
  function in bps…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-617
vendor: nasa-jpl
product: ION-DTN
affected:
  - ION-DTN <= 4.2.0
published: '2026-09-10'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T18:17:13.063'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-75584'
references:
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-9vgc-2r6g-6qwf
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/ion-dtn-a-1-denial-of-service-via-canonicalizepayloadblock-assertion
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00608
epssPercentile: 0.46757
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-18T17:11:52.214620Z'
ingestedAt: '2026-09-10T14:51:56.257Z'
---

## Overview

ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash the ION process by sending a BPv7 bundle with a zero-length payload. The canonicalizePayloadBlock() function in bpsec_util.c passes bundle->payload.length to zco_clone() without validating it against zero, causing a failed CHKZERO assertion that triggers sm_Abort() and terminates the process with SIGABRT before any HMAC verification occurs, requiring no valid key or credential to exploit.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.