CVE-2026-3592: Amplification vulnerabilities via self-pointed glue records

Published May 20, 2026
·
Updated

BIND resolvers are vulnerable to an amplified resource consumption/exhaustion attack. If a victim resolver makes a query to a specially crafted zone, the resolver will consume disproportionate resources. This issue affects BIND 9 versions 9.11.0 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, 9.11.3-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.

Affected Software

7 affected componentsFixes available
ISC BIND 9>=9.11.0<=9.16.50, >=9.18.0<=9.18.48, >=9.20.0<=9.20.22, >=9.21.0<=9.21.21, >=9.11.3-S1<=9.16.50-S1, >=9.18.11-S1<=9.18.48-S1, >=9.20.9-S1<=9.20.22-S1
ISC BIND>=9.11.0<=9.16.50
ISC BIND>=9.18.0<9.18.49
ISC BIND>=9.20.0<9.20.23
ISC BIND>=9.21.0<9.21.22
debian/bind9<=1:9.16.50-1~deb11u2, <=1:9.16.50-1~deb11u5, <=1:9.18.47-1~deb12u1, <=1:9.20.21-1~deb13u1
1:9.18.49-1~deb12u11:9.20.23-1~deb13u11:9.20.23-1
Microsoft azl3 bind 9.20.21-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/bind9 to a version that resolves this vulnerability.

    Fixed in 1:9.18.49-1~deb12u1Fixed in 1:9.20.23-1~deb13u1Fixed in 1:9.20.23-1
  2. Upgrade

    Upgrade ISC BIND 9 to a version that resolves this vulnerability.

    Fixed in 9.18.49
  3. Upgrade

    Upgrade ISC BIND 9 to a version that resolves this vulnerability.

    Fixed in 9.20.23
  4. Upgrade

    Upgrade ISC BIND 9 to a version that resolves this vulnerability.

    Fixed in 9.21.22
  5. Upgrade

    Upgrade ISC BIND 9 to a version that resolves this vulnerability.

    Fixed in 9.18.49-S1
  6. Upgrade

    Upgrade ISC BIND 9 to a version that resolves this vulnerability.

    Fixed in 9.20.23-S1

Event History

May 20, 2026
CVE Published
via MITRE·01:09 PM
Data Sourced
via MITRE·01:09 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·01:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
May 21, 2026
Data Sourced
via Launchpad·08:49 PM
Description
May 22, 2026
Data Sourced
via Ubuntu·08:48 PM
RemedyDescriptionSeverityAffected Software
May 23, 2026
Data Sourced
via Microsoft·08:01 AM
DescriptionSeverityWeaknessAffected Software
Data Sourced
via Debian·08:50 PM
DescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-3592?

CVE-2026-3592 is categorized as a moderate severity vulnerability affecting BIND 9 resolvers.

2

How do I fix CVE-2026-3592?

To fix CVE-2026-3592, upgrade to a non-vulnerable version of BIND 9, specifically versions beyond 9.16.50, 9.18.48, 9.20.22, or 9.21.21.

3

What systems are impacted by CVE-2026-3592?

CVE-2026-3592 affects ISC BIND 9 versions ranging from 9.11.0 to 9.16.50 and from 9.18.0 to 9.18.48, as well as several other specific releases.

4

What type of attack does CVE-2026-3592 enable?

CVE-2026-3592 enables amplification resource consumption and exhaustion attacks on BIND 9 DNS resolvers.

5

Is there a public exploit available for CVE-2026-3592?

As of now, there are no known public exploits available for CVE-2026-3592, but the vulnerability should be treated seriously due to its potential impact.

Company

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