CVE-2026-3592

Medium

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.

SeverityMedium

CVSS5.3

Exploit probability—

ProductIsc Bind

PublishedMay 20, 2026

First seenMay 20, 2026

Weakness typeCWE-408CWE-408

How to fix

Update

isc bind9.18.49, 9.20.23, 9.21.22 or later

Patches

Vendor advisories

kb.isc.org/docs/cve-2026-3592

Affected products

Product	Affected versions	Fixed in
isc bind	9.11.0 ≤ v ≤ 9.16.50, 9.18.0 ≤ v < 9.18.49, 9.20.0 ≤ v < 9.20.23, 9.21.0 ≤ v < 9.21.22	9.18.49, 9.20.23, 9.21.22

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