Use After Free Affecting unbound package, versions [1.15.0,1.25.2)
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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Test your applications- Snyk IDSNYK-UNMANAGED-UNBOUND-18507937
- published2 Aug 2026
- disclosed22 Jul 2026
- creditUnknown
Introduced: 22 Jul 2026
NewCVE-2026-50046 (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 Use After Free in the DNS-over-TLS forwarding or stub zone handling process when configured with a #authname suffix. An attacker can cause the daemon to crash by exploiting precise timing during transient network failures. This is only exploitable if DNS-over-TLS forwarding or stub zones with a #authname suffix are configured.
Workaround
This vulnerability can be mitigated by avoiding the use of a #authname suffix in DNS-over-TLS forwarding or stub zones unless necessary, and by restricting network access to the Unbound instance to trusted clients only, such as through firewall rules limiting inbound connections to the DoT port (typically 853) from secure sources.