CVE-2026-18458

Description

Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.3.0 before 7.3.1.6, from 6.1.2.21 before 6.1.*.

Overview

State: PUBLISHED
Assigner (CNA): RTI
CVSS severity: MEDIUM
CVSS score: 6.8 / 10
CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Effective score: 6.8 / 10 MEDIUM source: CNA overview
CWE(s): CWE-125, CWE-685, CWE-843
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-2026-18458.json

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-2026-84613
Assigner: RTI
Published: Sep 22, 2026, 5:50:17 PM
Updated: Sep 22, 2026, 6:48:29 PM
EUVD base score (CVSS 4.0): 6.8 / 10
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/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 (6.1.2.21 <6.1.*)

Connext Professional (7.3.0 <7.3.1.6)
Aliases: GHSA-25jc-v56j-jxq8

ENISA description: Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.3.0 before 7.3.1.6, from 6.1.2.21 before 6.1.*.

EUVD references (1)

https://www.rti.com/vulnerabilities/#cve-2026-18458

Affected products (1)

Vendor	Product	Versions	Platforms
RTI	Connext Professional	`7.4.0` (affected), `7.3.0` (affected), `6.1.2.21` (affected)	—

Vendor references (1)

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

https://www.rti.com/vulnerabilities/#cve-2026-18458

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-2026-18458 3f572a00-62e2-4423-959a-7ea25eff1638

Remediations (10)

CVE-2026-48558 | Arctic Wolf

web:arcticwolf.com

CVE - 2026 -48558 is a critical authentication bypass vulnerability in SimpleHelp Remote Monitoring and Management (RMM) software, caused by improper validation of OpenID Connect (OIDC) token signatures.

2026-09-23 15:46 UTC
CVE-2026-24858: The Fortinet Patch That Wasn't

web:blog.cyberdesserts.com

It is a limitation of the patching model itself. Continuous exposure management addresses this gap by treating vulnerability remediation as one input among many, not the entire strategy. If your security programme relies on patch status as the primary measure of risk, incidents like CVE - 2026 -24858 will keep surprising you.

2026-09-23 15:46 UTC
January 29 Advisory: Fortinet FortiCloud SSO Authentication Bypass [CVE ...

web:censys.com

Vulnerability Description: CVE - 2026 -24858 is a critical authentication bypass vulnerability (CVSS 9.4) affecting Fortinet FortiOS, FortiManager, FortiAnalyzer, FortiProxy, FortiWeb, and potentially FortiSwitch Manager. This vulnerability has been exploited in the wild and was added to the CISA Known Exploited Vulnerabilities catalog on January 27, 2026 , with a remediation deadline of January ...

2026-09-23 15:46 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 15:46 UTC
CVE-2026-24858: Patch Released for Fortinet FortiOS SSO Auth

web:socradar.io

Fortinet has released security updates and taken cloud-side mitigation steps, while government agencies have issued remediation deadlines. This blog explains what CVE - 2026 -24858 is, which products are affected, how the attacks worked, what indicators defenders should look for, and what actions organizations should take next.

2026-09-23 15:46 UTC
CVE-2026-24858 - vulnerability database | Vulners.com

web:vulners.com

CVE - 2026 -24858 is a high-severity authentication bypass affecting Fortinet FortiAnalyzer, FortiManager, FortiOS, FortiProxy, and FortiWeb (various 7.x versions) via FortiCloud SSO. The issue allows an attacker with a FortiCloud account and a regis...

2026-09-23 15:46 UTC
CVE-2026-45585 BitLocker Bypass Fixed in June 2026 Updates

web:windowsforum.com

Microsoft tracked YellowKey as CVE - 2026 -45585 and initially issued a mitigation while it prepared a full update. The important date for administrators is June 9, 2026 : Microsoft included a fix in its June Patch Tuesday security releases.

2026-09-23 15:46 UTC
Confirmed Zero-day Vulnerability in Fortinet Products (CVE-2026-24858)

web:www.esentire.com

THE THREAT On January 27th, 2026 , Fortinet released a security advisory disclosing a zero-day vulnerability impacting multiple Fortinet products. The flaw, tracked as CVE - 2026 -24858 (CVSS: 9.8), is a critical authentication bypass vulnerability in FortiOS, FortiManager, FortiAnalyzer, and FortiProxy. It allows an attacker with a FortiCloud account and a registered device to authenticate into ...

2026-09-23 15:46 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 15:46 UTC
CVE-2026-24858 | Fortinet Multiple Products Vulnerability | UpGuard

web:www.upguard.com

CVE - 2026 -24858 is a critical (CVSS 9.8) Fortinet authentication bypass vulnerability in FortiOS, FortiManager, and more, currently under active exploitation.

2026-09-23 15:46 UTC

AI Forensic Analysis

Only Available for Registered Users. Sign in to view.

Raw JSON

The full cvelistV5 record. Download as CVE-2026-18458.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-18458",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-22T18:48:21.717194Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-22T18:48:29.246Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "Core Libraries"
          ],
          "packageName": "connext_professional",
          "packageURL": "pkg:generic/connext_professional",
          "product": "Connext Professional",
          "vendor": "RTI",
          "versions": [
            {
              "lessThan": "7.7.0.1",
              "status": "affected",
              "version": "7.4.0",
              "versionType": "custom"
            },
            {
              "lessThan": "7.3.1.6",
              "status": "affected",
              "version": "7.3.0",
              "versionType": "custom"
            },
            {
              "lessThan": "6.1.*",
              "status": "affected",
              "version": "6.1.2.21",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:rti:connext_professional:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.7.0.1",
                  "versionStartIncluding": "7.4.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:rti:connext_professional:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3.1.6",
                  "versionStartIncluding": "7.3.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:rti:connext_professional:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.*",
                  "versionStartIncluding": "6.1.2.21",
                  "vulnerable": true
                }
              ],
              "negated": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "datePublic": "2026-09-15T17:47:50.129Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers.<p>This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.3.0 before 7.3.1.6, from 6.1.2.21 before 6.1.*.</p>"
            }
          ],
          "value": "Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.3.0 before 7.3.1.6, from 6.1.2.21 before 6.1.*."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-540",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-540 Overread Buffers"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "Security Extensions Enabled"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-685",
              "description": "CWE-685 Function Call With Incorrect Number of Arguments",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-843",
              "description": "CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T17:50:17.977Z",
        "orgId": "3f572a00-62e2-4423-959a-7ea25eff1638",
        "shortName": "RTI"
      },
      "references": [
        {
          "url": "https://www.rti.com/vulnerabilities/#cve-2026-18458"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Out-of-bounds Read, Function Call With Incorrect Number of Arguments, Access of Resource Using Incompatible Type ('Type Confusion') vulnerability in RTI Connext Professional (Core Libraries) allows Overread Buffers.",
      "x_generator": {
        "engine": "RTI Lubna 1.18.7"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "3f572a00-62e2-4423-959a-7ea25eff1638",
    "assignerShortName": "RTI",
    "cveId": "CVE-2026-18458",
    "datePublished": "2026-09-22T17:50:17.977Z",
    "dateReserved": "2026-07-31T07:29:34.430Z",
    "dateUpdated": "2026-09-22T18:48:29.246Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}