# CVE-2026-11605

## Summary

- **CVE ID:** CVE-2026-11605
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
- **CWE:** CWE-408
- **Published:** Jul 22, 2026
- **Last Modified:** Jul 24, 2026

## 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.

## Affected Products

- ISC — BIND 9 (9.20.0)
- ISC — BIND 9 (9.21.0)
- ISC — BIND 9 (9.20.9-S1)

## References

- [CNA](https://kb.isc.org/docs/cve-2026-11605)
- [CNA](https://downloads.isc.org/isc/bind9/9.20.26)
- [CNA](https://downloads.isc.org/isc/bind9/9.21.24)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.54%
- **EPSS Percentile:** 43.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._