---
id: CVE-2026-84484
title: >-
  ION-DTN versions before 4.2.0 contain an out-of-bounds read vulnerability in
  the decodeSdnv function that allows unauthenticated remote attackers to read
  memory by sending truncated SDNV values
summary: >-
  ION-DTN versions before 4.2.0 contain an out-of-bounds read vulnerability in
  the decodeSdnv function that allows unauthenticated remote attackers to read
  memory by sending truncated SDNV values. Attackers can send a UDP datagram to
  the L…
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-125
published: '2026-09-02'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:43.880'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84484'
references:
  - url: 'https://github.com/nasa-jpl/ION-DTN'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/blob/ion-open-source-4.1.4/ici/library/ion.c#L1693
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/blob/ion-open-source-4.1.4/ici/library/platform.c#L1982
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/commit/d52d22bdd383798712357f86a2778757f740e812
    label: disclosure@vulncheck.com
  - url: 'https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-85pw-28vw-2jf7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/ion-dtn-before-4.2.0-out-of-bounds-read-via-decodesdnv
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-85pw-28vw-2jf7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00867
epssPercentile: 0.57077
ingestedAt: '2026-09-23T17:28:14.819Z'
vendor: nasa-jpl
product: ION-DTN
affected:
  - ION-DTN < 4.2.0
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-04T02:21:47.136486Z'
---

## Overview

ION-DTN versions before 4.2.0 contain an out-of-bounds read vulnerability in the decodeSdnv function that allows unauthenticated remote attackers to read memory by sending truncated SDNV values. Attackers can send a UDP datagram to the LTP link service input port with a truncated SDNV to trigger reads up to nine bytes past buffer boundaries and underflow byte counters.

## Remediation

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