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CVE-2025-11411 is a cache poisoning vulnerability in NLnet Labs Unbound affecting versions up to and including 1.24.1. Unbound incorrectly accepts promiscuous NS RRSets included in the authority section of otherwise positive DNS replies and may use them to update delegation information for a zone. Because these unsolicited NS records can be treated as sufficiently trustworthy when they appear as in-zone data for the delegation point, an attacker can inject forged NS RRSets, and potentially corresponding address records, into resolver traffic and cause Unbound to replace or augment cached name server information for the target zone. The issue can be triggered through forged or manipulated DNS responses, including packet spoofing or fragmentation-based injection techniques. Version 1.24.1 introduced a partial fix that scrubs unsolicited NS RRSets and related address records from replies, and version 1.24.2 extended that protection to YXDOMAIN and non-referral NODATA replies. Later hardening in 1.25.1 further disregards unrelated additional-section address records relevant to this poisoning class.
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Cross-references every affected SKU, including bundled OEM variants.
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