CVE-2026-78301

MEDIUMPre-NVD 5.85.8—
EchelonGraph scoreHIGH confidence

Score 5.8 from GitHub Security Advisory published 2026-09-16. a secondary CVSS source baseline 5.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
5.8EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.8Exploit: None knownExposed: 0

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

A malformed zone may contain an NS or DNAME node above its origin, which named treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an out-of-zone delegation. On a server that also provides recursion BIND can follow this locally sourced cut and cache attacker-supplied data, affecting names outside the configured zone. This situation persists as long as the malformed zone remains in the zone database. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

CVSS v3
5.8
EG Score
5.8(high)
EG Risk
26(Track)
EG Risk 26/100SSVC: 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
Severity58% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
8%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (3)

Auto-updated Sep 16, 2026
No patch confirmed yet.
generic

CVE-2026-78301: Out-of-zone database nodes can become authoritative zone cuts

https://kb.isc.org/docs/cve-2026-78301
generic

Index of /isc/bind9/9.21.26

https://downloads.isc.org/isc/bind9/9.21.26
generic

Index of /isc/bind9/9.20.29

https://downloads.isc.org/isc/bind9/9.20.29

Vendor Advisories for CVE-2026-78301(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 13× in last 7d / 13× 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. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 18:34 UTCEG score recompute
  3. 2026-09-18 18:34 UTCGHSA enrichment
  4. 2026-09-17 19:27 UTCEG score recompute
  5. 2026-09-17 19:27 UTCGHSA enrichment
  6. 2026-09-17 18:59 UTCEG score recompute
  7. 2026-09-17 18:58 UTCGHSA enrichment
  8. 2026-09-17 18:37 UTCGHSA enrichment
  9. 2026-09-16 19:32 UTCEG score recompute
  10. 2026-09-16 19:32 UTCGHSA enrichment
  11. 2026-09-16 14:23 UTCEG score recompute
  12. 2026-09-16 14:06 UTCEG score recompute
  13. 2026-09-16 14:05 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-78301?
CVE-2026-78301 is a medium vulnerability published on September 16, 2026. A malformed zone may contain an NS or DNAME node above its origin, which named treats as a zone cut. If an attacker inserts a malformed zone into a BIND authoritative server (e.g., via zone transfer), queries for names inside the configured zone then lose authoritative status and return an…
When was CVE-2026-78301 disclosed?
CVE-2026-78301 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-78301 actively exploited?
CVE-2026-78301 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 92.0% of all scored CVEs.
What is the CVSS score of CVE-2026-78301?
CVE-2026-78301 has a CVSS v3 base score of 5.8 (NVD).
How do I remediate CVE-2026-78301?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-78301, 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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