Reachable Assertion Affecting unbound package, versions [1.22.0,1.25.2)
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
NewCVE-2026-14586 (opens in a new tab)How to fix?
Upgrade unbound to version 1.25.2 or higher.
Overview
Affected versions of this package are vulnerable to Reachable Assertion in the libngtcp2 process when handling DNS-over-QUIC (DoQ) traffic under high concurrency and network pressure. An attacker can cause the server to crash by exploiting a timing discrepancy, resulting in service disruption. This is only exploitable if the resolver is compiled with DoQ support and has a quic-port configured.
Workaround
This vulnerability can be mitigated by disabling DNS-over-QUIC (DoQ) by removing or commenting out any quic-port directives in the configuration file and restarting the service.