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unbound

NLnet Labs Unbound up to and including version 1.25.1 contains a vulnerability related to the 'unwanted-reply-threshold' feature. When enabled with a value greater than zero, glue records of 0.0.0.0/::0 can cause Unbound to repeatedly clear its DNS caches by triggering the unwanted reply counter. This can be exploited by an attacker controlling a delegation that returns such glue records, causing indefinite cache flushes without sending spoofed packets. The issue arises from a mismatch in IP addresses used internally by Unbound and the glue records, leading to false detection of unwanted replies.

In NLnet Labs Unbound versions up to 1.25.1, enabling 'unwanted-reply-threshold' with a value greater than zero allows an attacker controlling a DNS delegation to return in-bailiwick glue records of 0.0.0.0/::0. On systems routing such traffic (e.g., Linux routing to loopback), Unbound receives replies from its own listener IP (e.g., 127.0.0.1) that do not match the glue record IP, causing Unbound to count these as unwanted replies. When the counter reaches the configured threshold, Unbound clears its message and rrset caches defensively. Because the counter resets after each cache flush, the attacker can cause an indefinite loop of cache clearing without sending spoofed packets, effectively disrupting DNS resolution.

NLnet Labs Unbound up to and including version 1.25.1 contains a vulnerability related to the 'unwanted-reply-threshold' feature. When enabled with a value greater than zero, glue records of 0.0.0.0/::0 can cause Unbound to repeatedly clear its DNS caches by triggering the unwanted reply counter. Th

In NLnet Labs Unbound up to and including version 1.25.1, when 'unwanted-reply-threshold' is enabled (set to any value greater than zero), glue… (CVE-2026-50251)

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