CVE-2026-18459

Description

Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.1x before 5.1.*.

Overview

State: PUBLISHED
Assigner (CNA): RTI
CVSS severity: HIGH
CVSS score: 8.7 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Effective score: 8.7 / 10 HIGH source: CNA overview
CWE(s): CWE-682
Reserved: 2026-07-31
Published: 2026-09-22 17:50 UTC
Last updated: 2026-09-22 18:48 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/18xxx/CVE-2026-18459.json
Linked Threat: CVE-2026-18459 — Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality.

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published: 2026-09-22 18:17:11 UTC
NVD last modified: 2026-09-22 19:37:36 UTC

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID: EUVD-2026-84614
Assigner: RTI
Published: Sep 22, 2026, 5:50:19 PM
Updated: Sep 22, 2026, 6:48:01 PM
EUVD base score (CVSS 4.0): 8.7 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.0000
Vendors: RTI
Products: Connext Professional (7.4.0 <7.7.0.1)

Connext Professional (6.1.0 <6.1.*)

Connext Professional (5.3.0 <5.3.*)

Connext Professional (6.0.0 <6.0.*)

Connext Professional (7.0.0 <7.3.1.6)

Connext Professional (4.1x <5.1.*)

Connext Professional (5.2.0 <5.2.*)
Aliases: GHSA-fp84-96jf-3hg5

ENISA description: Incorrect Calculation vulnerability in RTI Connext Professional (Core Libraries) allows Abuse Existing Functionality. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.1x before 5.1.*.

EUVD references (1)

https://www.rti.com/vulnerabilities/#cve-2026-18459

Affected products (1)

Vendor	Product	Versions	Platforms
RTI	Connext Professional	`7.4.0` (affected), `7.0.0` (affected), `6.1.0` (affected), `6.0.0` (affected), `5.3.0` (affected), `5.2.0` (affected), `4.1x` (affected)	—

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

https://www.rti.com/vulnerabilities/#cve-2026-18459

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (1)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

https://www.rti.com/vulnerabilities/#cve-2026-18459 3f572a00-62e2-4423-959a-7ea25eff1638

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

CVE-2026-18459 · RTI · CVSS 8.7 · CVE Brief Analyst Report

web:cvebrief.com

An incorrect calculation vulnerability in the RTI Connext Professional Core Libraries allows for the abuse of existing functionality.

2026-09-23 15:19 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:19 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:19 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:19 UTC
SharePoint Vulnerability CVE-2026-45659 Exploited [2026]

web:tech-insider.org

SharePoint vulnerability CVE - 2026 -45659 is under active exploitation. See the CVSS 8.8 RCE risk, affected on-prem versions and CISA's July 4 patch deadline.

2026-09-23 15:19 UTC
CVE-2026-18459 - Detail CVSS, EPSS & CISA Kev | CVE Find

web:www.cvefind.com

Full details for CVE-2026-18459 : technical description, impact, CVSS/EPSS scores, linked CWE, CAPEC, affected CPEs, disclosure date, and mitigation options.

2026-09-23 15:19 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:19 UTC
CVE-2026-45659, SharePoint RCE That Needs More Than a Patch Ticket

web:www.penligent.ai

CVE - 2026 -45659 is a SharePoint Server deserialization RCE now in CISA KEV. Learn affected builds, patch checks, detection logic, and safe response steps.

2026-09-23 15:19 UTC
CVE-2026-45659: Microsoft SharePoint Server RCE Vulnerability

web:www.sentinelone.com

CVE - 2026 -45659 is a remote code execution vulnerability in Microsoft SharePoint Server. Learn about its impact, affected versions, and mitigation methods.

2026-09-23 15:19 UTC
Patch Tuesday September 2026: Security Updates & CVE Analysis

web:zecurit.com

Get the complete breakdown of Microsoft's September 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .

2026-09-23 15:19 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-18459.json.

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