CVE-2026-4374
XXE in RTI Connext Professional enables external entity processing.
Is CVE-2026-4374 being exploited?
Not confirmed. CVE-2026-4374 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.24% probability of exploitation in the next 30 days.
How severe is CVE-2026-4374?
CVE-2026-4374 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-4374?
Yes. A fix has been recorded for CVE-2026-4374. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-4374 affect?
CVE-2026-4374 affects RTI Connext Professional (Routing Service, Observability Collector, Recording Service, Queueing Service, Cloud Discovery Service). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-4374?
Apply vendor patch when available; review XML handling and restrict inputs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Allows data leakage or SSRF via crafted XML to RTI Connext services (XXE).
Patch when possible
- affected>= 7.4.0 and < 7.7.0
- affected>= 7.1.0 and < 7.3.1.1
- affected>= 6.1.0 and < 6.1.2.34
- affected>= 6.0.0 and < 6.0.*
- affected>= 5.3.0 and < 5.3.*
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.