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CVE-2026-3039

36
FAUCET Score

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.

First published: May 20, 2026Last modified: May 20, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 9.0.0, <= 9.16.50CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
>= 9.18.0, < 9.18.49CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
>= 9.20.0, < 9.20.23CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*
>= 9.21.0, < 9.21.22CPE matchmatch criteria
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.05%
Probability of exploitation in next 30 days
EPSS Percentile
60.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0105 is in the 37th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

microsoftpatch availablevia msrc
Product: 21351-17084Fixed in: 9.20.23-1
microsoftpatch availablevia msrc
Product: azl3 bind 9.20.21-1 on Azure Linux 3.0Fixed in: 9.20.23-1
ubuntupatch availablevia ubuntu_usn
Product: bind9 (jammy)Fixed in: 1:9.18.39-0ubuntu0.22.04.4
ubuntupatch availablevia ubuntu_usn
Product: bind9 (noble)Fixed in: 1:9.18.39-0ubuntu0.24.04.5
ubuntupatch availablevia ubuntu_usn
Product: bind9 (questing)Fixed in: 1:9.20.11-1ubuntu2.4
ubuntupatch availablevia ubuntu_usn
Product: bind9 (resolute)Fixed in: 1:9.20.18-1ubuntu2.1

Vendor Advisories (2)

ubuntuUSN-8293-1

Bind vulnerabilities

May 21, 2026
microsoft2026-May/CVE-2026-3039Important

BIND 9 server memory exhaustion during GSS-API TKEY negotiation

May 12, 2026

References

access.redhat.com / errata/RHSA-2026:20334
access.redhat.com / errata/RHSA-2026:23360
access.redhat.com / errata/RHSA-2026:24338
access.redhat.com / errata/RHSA-2026:24339
access.redhat.com / errata/RHSA-2026:24367
access.redhat.com / errata/RHSA-2026:24368
access.redhat.com / security/cve/CVE-2026-3039
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-3039.json
downloads.isc.org / isc/bind9/9.18.49
Patch
downloads.isc.org / isc/bind9/9.20.23
Patch
downloads.isc.org / isc/bind9/9.21.22
Patch
kb.isc.org / docs/cve-2026-3039
Vendor Advisory