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unbound

NLnet Labs Unbound versions 1.22.0 through 1.25.1 contain a vulnerability where a single client query for a deeply nested name under a DNSSEC-signed parent causes Unbound to send more upstream packets than the configured 'max-global-quota'. This bypasses the intended limit on upstream amplification traffic. The vulnerability has a CVSS score of 5.3 (medium severity) and does not impact confidentiality or integrity but affects availability. No known exploits are reported in the wild. The affected versions include multiple specific builds primarily on Ubuntu platforms.

In NLnet Labs Unbound versions 1.22.0 up to and including 1.25.1, a vulnerability exists where a single client query for a deeply nested DNS name under a DNSSEC-signed parent causes Unbound to exceed the configured 'max-global-quota' for upstream packets. This effectively bypasses the security configuration intended to limit upstream amplification traffic, potentially leading to resource exhaustion or denial of service conditions. The vulnerability is identified as CVE-2026-50045 with a CVSS v3.1 base score of 5.3, reflecting a medium severity impact primarily on availability.

NLnet Labs Unbound versions 1.22.0 through 1.25.1 contain a vulnerability where a single client query for a deeply nested name under a DNSSEC-signed parent causes Unbound to send more upstream packets than the configured 'max-global-quota'. This bypasses the intended limit on upstream amplification 

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a single client query for a deeply nested name under a DNSSEC-signed parent can cause… (CVE-2026-50045)

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