Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers. (CVE-2026-7866) | HOL Guard CVE

Critical · CVSS 10.0CVE-2026-7866

Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers.

Answer in brief

CVE-2026-7866 records a Critical severity (CVSS 10.0) vulnerability in Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers.. The current sources do not mark it as known exploited. The current feed maps RTI/Connext Professional (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 22, 2026Source checked Sep 22, 2026First seen by HOL Sep 22, 2026Material review Sep 22, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 10.0
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 10.0. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps RTI/Connext Professional (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
RTI/Connext Professionalgeneric	>=7.4.0 <7.7.0.1 \|\| >=7.0.0 <7.3.1.6 \|\| >=6.1.0 <6.1.* \|\| >=6.0.0 <6.0.* \|\| >=5.3.0 <5.3.* \|\| >=5.2.0 <5.2.* \|\| >=4.3x <5.1.*	7.7.0.1, 7.3.1.6, 6.1., 6.0., 5.3., 5.2., 5.1.*

Recommended response

Check inventory. Check lockfiles and deployed manifests for RTI/Connext Professional.
Review the reported fix. Update RTI/Connext Professional to 7.7.0.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 22, 2026

Sources and claim methodology

Source referencerti.com

Upstream source description

Stack-based Buffer Overflow vulnerability in RTI Connext Professional (Core Libraries) allows Overflow Buffers. This issue affects Connext Professional: from 7.4.0 before 7.7.0.1, from 7.0.0 before 7.3.1.6, from 6.1.0 before 6.1.*, from 6.0.0 before 6.0.*, from 5.3.0 before 5.3.*, from 5.2.0 before 5.2.*, from 4.3x before 5.1.*.

Quoted source text, attributed separately from HOL analysis.