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CVE-2026-4374

Rti Connext Professional XML external entity (XXE)

9.1 CRITICALEPSS 0.39%
  1. Published1 Apr 2026

Description

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.*.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected products

Rti Connext Professional≥ 5.3.0 ≤ 5.3.1.45 · ≥ 6.0.0 ≤ 6.0.1.40 · ≥ 6.1.0 ≤ 6.1.2.27 · ≥ 7.0.0 < 7.3.1.1

Remediation

Fixed in
Rti Connext Professional≥ 7.3.1.1

References

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Frequently asked

Is CVE-2026-4374 being actively exploited?

CVE-2026-4374 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.39%.

How severe is CVE-2026-4374?

CVE-2026-4374 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.39% probability of exploitation.

Which products are affected by CVE-2026-4374?

Affected products include Rti Connext Professional.

How do I fix CVE-2026-4374?

Upgrade affected software to a fixed version, for example Rti Connext Professional 7.3.1.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-4374 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.