HOMEVULNERABILITIESCVE-2026-3039
HIGH

CVE-2026-3039

CWE-771Published: May 20, 2026· Updated: May 21, 2026

7.5
CVSS v3.1
EPSS:0.08%probability of exploitation in 30 daysPercentile:23.3th

Official Description

BIND servers that are configured to use TKEY-based authentication via GSS-API tokens are vulnerable to excessive memory consumption when receiving and processing maliciously-constructed packets. Typically these servers will be found in Active Directory integrated DNS deployments and/or Kerberos-secured DNS environments.

This issue affects BIND 9 versions 9.0.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.9.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

NVD Source

Technical Analysis

CVE-2026-3039 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

isc1 product
bind
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://downloads.isc.org/isc/bind9/9.18.49
PATCHhttps://downloads.isc.org/isc/bind9/9.20.23
PATCHhttps://downloads.isc.org/isc/bind9/9.21.22
ADVISORYhttps://kb.isc.org/docs/cve-2026-3039

All References (4)

→
https://downloads.isc.org/isc/bind9/9.18.49Patch
→
https://downloads.isc.org/isc/bind9/9.20.23Patch
→
https://downloads.isc.org/isc/bind9/9.21.22Patch
→
https://kb.isc.org/docs/cve-2026-3039Vendor Advisory

Quick Facts

CVE IDCVE-2026-3039
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-771
CISA KEVNo
EPSS (30d)0.08%
Affected1 vendor
PublishedMay 20, 2026

Related CVEs (CWE-771)

CVE-2026-20004
7.4

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-3039 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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