Threats Tagged 'cve-2026-109125'
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Threats Tagged 'cve-2026-109125'
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CVE-2026-109125 is a cache side-channel vulnerability in NLnet Labs Unbound up to version 1.26.1. It arises when the 'unwanted-reply-threshold' configuration is set above zero, which is not the default. An attacker can observe cache clearing behavior triggered by unwanted UDP replies with mismatched TXIDs, allowing inference of the upstream source port. This side-channel can facilitate source port filtering and TXID guessing, potentially enabling cache poisoning attacks. The vulnerability has a medium severity with a CVSS score of 5.3. It is not exploitable under default configurations and is unreliable on public resolvers with high threshold values. No official patch or fix is explicitly stated in the provided data. Join the discussion | CVE Database V5 | 10/21/2026, 08:56:35 UTC Added: 10/21/2026, 09:03:56 UTC |
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