Improper Validation of Specified Quantity in Input Affecting bind package, versions [9.11.0,9.20.26)[9.21.0,9.21.24)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Jul 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
CVE-2026-11721 (opens in a new tab)How to fix?
Upgrade bind to version 9.20.26, 9.21.24 or higher.
Overview
Affected versions of this package are vulnerable to Improper Validation of Specified Quantity in Input via the synth-from-dnssec process. An attacker can manipulate DNS responses to inject unauthorized records into the cache by exploiting a label count discrepancy in RRSIG records combined with wildcards. This is only exploitable if the resolver has synth-from-dnssec yes; enabled (which is the default).