CVE-2026-3592
Analyzed Analyzed - Analysis Complete
Amplified Resource Consumption in BIND Resolver

Publication date: 2026-05-20

Last updated on: 2026-05-21

Assigner: Internet Systems Consortium (ISC)

Description
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.
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Meta Information
Published
2026-05-20
Last Modified
2026-05-21
Generated
2026-06-10
AI Q&A
2026-05-20
EPSS Evaluated
2026-06-08
NVD
CVE-2026-3592
EUVD
EUVD-2026-31106
Affected Vendors & Products
Showing 4 associated CPEs
Vendor Product Version / Range
isc bind From 9.20.0 (inc) to 9.20.23 (exc)
isc bind From 9.21.0 (inc) to 9.21.22 (exc)
isc bind From 9.11.0 (inc) to 9.16.50 (inc)
isc bind From 9.18.0 (inc) to 9.18.49 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-408 The product allows an entity to perform a legitimate but expensive operation before authentication or authorization has taken place.
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Executive Summary

CVE-2026-3592 is a medium-severity vulnerability in BIND 9 DNS resolver software involving amplification caused by self-pointed glue records.

When a victim resolver queries a specially crafted zone, it consumes disproportionate resources, leading to excessive bandwidth usage and potential impairment of TCP functionality.

This primarily affects recursive resolvers, while authoritative-only servers with trusted zones are not affected unless tricked into querying an attack domain.

Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

Impact Analysis

The vulnerability can cause your BIND 9 resolver to consume excessive resources when processing queries to specially crafted zones.

This resource exhaustion can lead to increased bandwidth usage and may impair TCP functionality, potentially degrading the performance and reliability of your DNS resolver.

Mitigation Strategies

The recommended immediate step to mitigate this vulnerability is to upgrade BIND 9 to the patched versions: 9.18.49, 9.20.23, or 9.21.22, or their corresponding Supported Preview Edition releases.

No workarounds are currently available for this vulnerability.

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