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CVE-2026-30803 RTI CVE debrief

CVE-2026-30803 is an Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) that allows Overread Buffers. The issue affects Connext Micro versions from 4.0.0 before 4.3.0. Defenders should assess exposure, prioritize remediation, and verify vulnerability status. This vulnerability has a high severity score of 8.8, indicating significant potential impact. Affected deployments should be identified, and owners assigned for follow-up. Official advisories and CVE records should be reviewed to validate scope, severity, and vendor guidance. Compensating controls should be considered for exposed systems while remediation is planned and verified.

Vendor
RTI
Product
Connext Micro
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-17
Original CVE updated
2026-09-22
Advisory published
2026-06-17
Advisory updated
2026-09-22

Who should care

Defenders responsible for RTI Connext Micro deployments, especially those using versions 4.0.0 to 4.2.0, should assess exposure and prioritize remediation.

Why it matters

CVE-2026-30803 is an Integer Underflow vulnerability in RTI Connext Micro that allows Overread Buffers. Defenders should assess exposure, prioritize remediation, and verify vulnerability status.

  • Verify vulnerability status in RTI Connext Micro deployments
  • Assess exposure for versions 4.0.0 to 4.2.0
  • Prioritize remediation for affected versions

Technical summary

The Integer Underflow (Wrap or Wraparound) vulnerability in RTI Connext Micro (Core Libraries) allows Overread Buffers. The issue affects Connext Micro versions from 4.0.0 before 4.3.0. The CVSS score is 8.8, indicating a high severity. This vulnerability can lead to significant operational impacts if exploited, including potential data breaches or system compromise. Defenders should prioritize verifying vulnerability status and assessing exposure in RTI Connext Micro deployments, especially for versions 4.0.0 to 4.2.0, and consider upgrading to version 4.3.0 or 4

Defensive priority

Defenders should prioritize verifying vulnerability status and assessing exposure in RTI Connext Micro deployments, especially for versions 4.0.0 to 4.2.0, and consider upgrading to version 4.3.0 or later.

Recommended defensive actions

  • Verify RTI Connext Micro version and assess exposure
  • Prioritize remediation for affected versions 4.0.0 to 4.2.0
  • Consider upgrading to version 4.3.0 or later

Evidence notes

The CVE record and NVD entry provide details on the Integer Underflow vulnerability in RTI Connext Micro. The vendor advisory from RTI is referenced, but its contents are not specified.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-30803 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-30803

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-30803 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-30803

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://www.rti.com/vulnerabilities/

    3f572a00-62e2-4423-959a-7ea25eff1638 - Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.