---
id: CVE-2026-4374
title: >-
  Improper Restriction of XML External Entity Reference vulnerability in RTI
  Connext Professional (Recording Service,Routing Service,Queueing Service,Cloud
  Discovery Service,Observability Collector) allows Serialized Data External
  Linking,…
summary: >-
  Improper Restriction of XML External Entity Reference vulnerability in RTI
  Connext Professional (Recording Service,Routing Service,Queueing Service,Cloud
  Discovery Service,Observability Collector) allows Serialized Data External
  Linking,…
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-611
vendor: rti
product: connext_professional
affected:
  - 'connext_professional >= 5.3.0, <= 5.3.1.45'
  - 'connext_professional >= 6.0.0, <= 6.0.1.40'
  - 'connext_professional >= 6.1.0, <= 6.1.2.27'
  - 'connext_professional >= 7.0.0, < 7.3.1.1'
  - 'connext_professional >= 7.4.0, < 7.7.0'
patched:
  - connext_professional 7.7.0
published: '2026-04-01'
updated: '2026-09-22'
sourceUpdated: '2026-09-22T18:17:14.863'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4374'
references:
  - url: 'https://www.rti.com/vulnerabilities/#cve-2026-4374'
    label: 3f572a00-62e2-4423-959a-7ea25eff1638
tags:
  - nvd
  - cve.org
epss: 0.00235
epssPercentile: 0.14749
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-04-01T14:23:31.865417Z'
scores:
  nvd: 9.1
  cna: 8.8
ingestedAt: '2026-09-22T18:08:12.485Z'
---

## Overview

Improper Restriction of XML External Entity Reference vulnerability in RTI Connext Professional (Recording Service,Routing Service,Queueing Service,Cloud Discovery Service,Observability Collector) allows Serialized Data External Linking, Data Serialization External Entities Blowup. This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.0.0 before 7.3.1.1, from 6.1.0 before 6.1.2.34, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*.

## Affected

- `connext_professional >= 5.3.0, <= 5.3.1.45`
- `connext_professional >= 6.0.0, <= 6.0.1.40`
- `connext_professional >= 6.1.0, <= 6.1.2.27`
- `connext_professional >= 7.0.0, < 7.3.1.1`
- `connext_professional >= 7.4.0, < 7.7.0`

## Remediation

Upgrade past the affected range:

- `connext_professional 7.7.0`