CVE-2026-30803: Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers.

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-17 · updated 2026-10-26
Weakness: CWE-191

Description

Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers. This issue affects Connext Micro: from 4.0.0 before 4.3.0.

Affected products

RTI Connext Micro: from 4.0.0 before 4.3.0 — fixed in 4.3.0

How to fix

Upgrade to a fixed version: RTI Connext Micro 4.3.0. Check the vendor advisory for mitigations.

References

https://www.rti.com/vulnerabilities/#cve-2026-30803

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