CVE-2026-86246

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-23. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, ghsa
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 9.1Exploit: None knownExposed: 0

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

Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOW_CLIENT_RENEGOTIATION, NO_EXTENDED_MASTER_SECRET, IGNORE_UNEXPECTED_EOF and ALLOW_NO_DHE_KEX.

This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier unsupported versions may also be affected.

Users are recommended to upgrade to version 2.0.16 or 1.3.9, which fix the issue.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 23, 2026

Last Modified

September 23, 2026

Advisory Details (1)

Auto-updated Sep 23, 2026
No patch confirmed yet.
generic
https://lists.apache.org/thread/dgyvfwb24nbk45ptvlhdyhdhl5o7k5ol

Vendor Advisories for CVE-2026-86246(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 12× in last 7d / 12× 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. 2026-09-23 23:50 UTCGHSA enrichment
  2. 2026-09-23 19:29 UTCEG score recompute
  3. 2026-09-23 19:29 UTCGHSA enrichment
  4. 2026-09-23 18:23 UTCGHSA enrichment
  5. 2026-09-23 17:59 UTCGHSA enrichment
  6. 2026-09-23 16:18 UTCGHSA enrichment
  7. 2026-09-23 15:44 UTCEG score recompute▲ 9.10
  8. 2026-09-23 15:44 UTCGHSA enrichment
  9. 2026-09-23 15:44 UTCMITRE cvelistV5CVSS v3 → 9.1 · severity → CRITICAL
  10. 2026-09-23 13:17 UTCNVD update
  11. 2026-09-23 12:46 UTCEG score recompute
  12. 2026-09-23 12:45 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(4)

What is CVE-2026-86246?
CVE-2026-86246 is a critical vulnerability published on September 23, 2026. Initialization of a resource with an insecure default vulnerability in Apache Tomcat Native enabled insecure options by default including ALLOWCLIENTRENEGOTIATION, NOEXTENDEDMASTERSECRET, IGNOREUNEXPECTEDEOF and ALLOWNODHEKEX. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from…
When was CVE-2026-86246 disclosed?
CVE-2026-86246 was first published in the National Vulnerability Database on September 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-86246?
CVE-2026-86246 has a CVSS v3.1 base score of 9.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-86246?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86246, 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

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