CVE-2026-19941

checkwildcard() accepts an out-of-zone NSEC as a wildcard-nonexistence proof

Published: Sep 16, 2026Updated: Sep 17, 2026 Sources: CVE List NVDCWE-345

5.9MEDIUM

Description

An inapplicable NSEC record may be accepted by a `named` resolver as proof that no wildcard exists, which could allow an attacker at the same or an upstream level of the zone name to mask the existence of a victim's wildcard record. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:HAttack Complexity

High

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:HIntegrity

High

A:NAvailability

None

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Weaknesses

CWE-345

Affected Products

ISC

commercial·USaka internet systems consortium

BIND 9

Networking Infrastructure

Exploitability

0 exploit sources identified

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Official Patch Available

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Collection

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References

https://downloads.isc.org/isc/bind9/9.20.29

downloads.isc.org

https://downloads.isc.org/isc/bind9/9.21.26

downloads.isc.org

https://kb.isc.org/docs/cve-2026-19941

kb.isc.org

News mentions

BIND 9 Update Fixes 14 Flaws, Including an Unauthenticated Crash Over DNS-over-HTTPS
en·The Hacker News·Sep 17, 2026 Patch BIND 9 network-edge

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