Reachable Assertion Affecting bind package, versions [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-2026-77692 (opens in a new tab)How to fix?
Upgrade bind to version 9.20.29, 9.21.26 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion in the named process when handling specially crafted DNS-over-HTTPS requests containing invalid SIG(0) records. An attacker can cause the service to terminate unexpectedly by sending such a request and prematurely closing the connection, resulting in service unavailability.
Workaround
This vulnerability can be mitigated by restricting access to the service to trusted clients only, or by disabling DNS-over-HTTPS if it is not required. Additionally, configure firewall rules to only allow connections from trusted IP ranges to port 53 (UDP and TCP).