CVE-2026-7866

CRITICALPre-NVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 4 sources updated this week
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.*.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
24%
KEV
Not listed

Published

September 22, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic

RTI Connext Security Bulletins and Advisories (last updated on 2026-09-22)

https://www.rti.com/vulnerabilities/#cve-2026-7866

Vendor Advisories for CVE-2026-7866(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 21× in last 7d / 21× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 04:49 UTCGHSA enrichment
  2. 2026-09-24 00:47 UTCGHSA enrichment
  3. 2026-09-23 20:46 UTCEG score recompute
  4. 2026-09-23 20:46 UTCGHSA enrichment
  5. 2026-09-23 17:54 UTCEPSS rescore
  6. 2026-09-23 16:44 UTCGHSA enrichment
  7. 2026-09-23 12:43 UTCGHSA enrichment
  8. 2026-09-23 08:42 UTCGHSA enrichment
  9. 2026-09-23 04:41 UTCEG score recompute
  10. 2026-09-23 04:41 UTCGHSA enrichment
  11. 2026-09-23 04:03 UTCEG score recompute
  12. 2026-09-23 04:03 UTCGHSA enrichment
  13. 2026-09-23 03:40 UTCGHSA enrichment
  14. 2026-09-22 23:39 UTCGHSA enrichment
  15. 2026-09-22 19:37 UTCEG score recompute
  16. 2026-09-22 19:37 UTCGHSA enrichment
  17. 2026-09-22 18:59 UTCEG score recompute
  18. 2026-09-22 18:59 UTCGHSA enrichment
  19. 2026-09-22 18:31 UTCEG score recompute
  20. 2026-09-22 17:53 UTCEG score recompute
  21. 2026-09-22 17:53 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7866?
CVE-2026-7866 is a critical vulnerability published on September 22, 2026. 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…
When was CVE-2026-7866 disclosed?
CVE-2026-7866 was first published in the National Vulnerability Database on September 22, 2026, with the most recent update on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7866 actively exploited?
CVE-2026-7866 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.8% of all scored CVEs.
What is the CVSS score of CVE-2026-7866?
CVE-2026-7866 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-7866?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7866, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-7866

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