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CVE-2026-11605

Unnecessary validation of DNSSEC signed records

Published: Jul 22, 2026Updated: Jul 22, 2026 Sources: CVE List NVDCWE-408
7.5HIGH
NVD MITRE
EPSS Score
0.5%
Top 58.6%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available
Self-Check
OpenVAS

Description

The issue is a resource exhaustion vulnerability associated with DNSSEC validation. BIND always validates all RRSIG records in an answer, even if they are not strictly needed. A query to an authoritative server/zone which returns many valid but superfluous RRSIG records causes the validator to waste disproportionate CPU time. This issue affects BIND 9 versions 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, and 9.20.9-S1 through 9.20.24-S1.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-408

Affected Products

ISC
commercial·USaka internet systems consortium
BIND 9
Networking Infrastructure

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available
Workaround Available
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References

https://kb.isc.org/docs/cve-2026-11605
kb.isc.org
https://downloads.isc.org/isc/bind9/9.20.26
downloads.isc.org
https://downloads.isc.org/isc/bind9/9.21.24
downloads.isc.org

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