Infinite loop Affecting unbound package, versions [,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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Test your applications- Snyk IDSNYK-UNMANAGED-UNBOUND-18507932
- published2 Aug 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
NewCVE-2026-50251 (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 Infinite loop when the unwanted-reply-threshold option is enabled in the configuration. An attacker can disrupt DNS resolution and cause repeated clearing of DNS caches by sending specially crafted glue records that exploit the handling of locally routed 0.0.0.0/::0 glue records.
Workaround
This vulnerability can be mitigated by disabling the unwanted-reply-threshold option by setting it to 0 in the configuration file and restarting the service.