Improper Resource Locking Affecting unbound package, versions [1.14.0,1.25.1)
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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- published22 May 2026
- disclosed20 May 2026
- creditQifan Zhang
Introduced: 20 May 2026
CVE-2026-44608 (opens in a new tab)How to fix?
Upgrade unbound to version 1.25.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Resource Locking in multi-threaded environments when a locking inconsistency occurs during an RPZ zone transfer reload involving rpz-nsip or rpz-nsdname triggers. An attacker can cause a system crash by exploiting a timing issue that leads to a heap use-after-free condition during the reload process.
Workaround
This vulnerability can be mitigated by avoiding the use of rpz-nsip or rpz-nsdname triggers within Response Policy Zones configured for zone transfer reloads, or by configuring the service to use local RPZ files instead of XFR for these zones.