---
id: CVE-2026-30803
title: >-
  Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro
  (Core Libraries) allows Overread Buffers
summary: >-
  Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro
  (Core Libraries) allows Overread Buffers. This issue affects Connext Micro:
  from 4.0.0 before 4.3.0.
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-191
vendor: rti
product: connext_micro
affected:
  - 'connext_micro >= 4.0.0, < 4.3.0'
patched:
  - connext_micro 4.3.0
published: '2026-06-17'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T18:17:13.680'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-30803'
references:
  - url: 'https://www.rti.com/vulnerabilities/#cve-2026-30803'
    label: 3f572a00-62e2-4423-959a-7ea25eff1638
tags:
  - nvd
  - cve.org
epss: 0.00508
epssPercentile: 0.40893
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-06-17T17:58:11.377761Z'
scores:
  nvd: 9.1
  cna: 8.8
ingestedAt: '2026-09-22T18:08:12.471Z'
---

## Overview

Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers. This issue affects Connext Micro: from 4.0.0 before 4.3.0.

## Affected

- `connext_micro >= 4.0.0, < 4.3.0`

## Remediation

Upgrade past the affected range:

- `connext_micro 4.3.0`