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CVE-2026-45674 is a high severity vulnerability with a CVSS score of 8.7. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
Netty's DnsResolveContext fails to validate the origin (bailiwick) of CNAME records in DNS responses.
In io.netty.resolver.dns.DnsResolveContext#buildAliasMap, the resolver processes the ANSWER section of a DNS response and blindly caches all CNAME records it finds.
According to https://datatracker.ietf.org/doc/html/rfc5452#section-6
Care must be taken to only accept
data if it is known that the originator is authoritative for the
QNAME or a parent of the QNAME.
One very simple way to achieve this is to only accept data if it is
part of the domain for which the query was intended.
DNS Cache Poisoning (Bailiwick Bypass). Any application using Netty's DNS resolver is impacted.
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