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unbound

NLnet Labs Unbound versions 1.6.2 through 1.25.1 have a vulnerability in the 'respip' module when used with 'response-ip' redirect rules or RPZ files with RPZ-IP triggers. The rewriting handler does not verify the security status of upstream DNS answers, allowing BOGUS A/AAAA answers to be rewritten to operator-configured IPs with a hardcoded INSECURE security level. This can cause clients to receive insecure NOERROR replies redirected to potentially malicious IPs.

In NLnet Labs Unbound versions 1.6.2 up to and including 1.25.1, when configured with the 'respip' module preceding the validator and using 'response-ip' redirect rules or RPZ files with RPZ-IP triggers, the rewriting handler fails to check the security status of upstream DNS answers. Specifically, if the validator encounters an expired or invalid RRSIG on an answer whose A record matches a 'response-ip' or RPZ-IP configuration, the answer is rewritten and assigned a hardcoded INSECURE security level. This results in clients receiving INSECURE NOERROR replies that are rewritten to operator-configured IP addresses. A malicious actor can exploit this by spoofing BOGUS A/AAAA answers within the operator's configured subnet rewrites, causing DNSSEC-protected answers to be insecurely redirected.

NLnet Labs Unbound versions 1.6.2 through 1.25.1 have a vulnerability in the 'respip' module when used with 'response-ip' redirect rules or RPZ files with RPZ-IP triggers. The rewriting handler does not verify the security status of upstream DNS answers, allowing BOGUS A/AAAA answers to be rewritten

In NLnet Labs Unbound 1.6.2 up to and including 1.25.1, when Unbound is configured with the 'respip' module in front of the validator together with… (CVE-2026-50243)

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Threats Tagged 'ubuntu-cve-2026-50243'

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