How severe is CVE-2026-4374?

CVE-2026-4374 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.

Is CVE-2026-4374 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-4374?

CVE-2026-4374 affects Rti Connext Professional. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-4374?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-4374 have an EU (EUVD) identifier?

Yes. CVE-2026-4374 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17765.

When was CVE-2026-4374 published?

CVE-2026-4374 was published on 2026-04-01 and last updated on 2026-06-17.

CVE-2026-4374

CVE-2026-4374 is a critical-severity vulnerability in Rti Connext Professional with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-611.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 8.8
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17765
Weakness: CWE-611
Affected product: Rti Connext Professional
Published: 2026-04-01
Last modified: 2026-06-17

Description

Improper Restriction of XML External Entity Reference vulnerability in RTI Connext Professional (Cloud Discovery Service, Recording Service, Routing Service, Queueing Service, Observability Collector) allows Serialized Data External Linking, Data Serialization External Entities Blowup.<p>This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.1.0 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.*.</p>

Frequently asked questions

What is CVE-2026-4374?: Improper Restriction of XML External Entity Reference vulnerability in RTI Connext Professional (Cloud Discovery Service, Recording Service, Routing Service, Queueing Service, Observability Collector) allows Serialized Data External Linking, Data Serialization External Entities Blowup.<p>This issue affects Connext Professional: from 7.4.0 before 7.7.0, from 7.1.0 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.*.</p>
How severe is CVE-2026-4374?: CVE-2026-4374 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
Is CVE-2026-4374 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-4374?: CVE-2026-4374 affects Rti Connext Professional. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-4374?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-4374 have an EU (EUVD) identifier?: Yes. CVE-2026-4374 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17765.
When was CVE-2026-4374 published?: CVE-2026-4374 was published on 2026-04-01 and last updated on 2026-06-17.

References

https://www.rti.com/vulnerabilities/#cve-2026-4374

Affected products (1)

cpe:2.3:a:rti:connext_professional:*:*:*:*:*:*:*:*

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