Reachable Assertion Affecting bind package, versions [9.11.0,9.19.0)[9.20.0,9.20.29)[9.21.0,9.21.26)
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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- published24 Sept 2026
- disclosed16 Sept 2026
- creditUnknown
Introduced: 16 Sep 2026
NewCVE-2026-19666 (opens in a new tab)How to fix?
Upgrade bind to version 9.19.0, 9.20.29, 9.21.26 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion via the dns64 process. An attacker can cause the named process to terminate unexpectedly by sending a specially crafted malformed DNS64 response from an authoritative server, resulting in service unavailability. This is only exploitable if the dns64 feature is explicitly enabled in the resolver's configuration.
Workaround
This vulnerability can be mitigated by disabling the dns64 feature in the resolver configuration if it is not required.