Insufficient verification of data authenticity in Netty - CVE-2026-45674
Published: June 8, 2026
Vulnerability identifier: #VU133448
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-45674
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Netty project
Affected software:
Netty
Netty
Detailed vulnerability description
The vulnerability allows a remote attacker to poison the DNS cache.
The vulnerability exists due to insufficient verification of data authenticity in DnsResolveContext buildAliasMap when processing CNAME records in DNS responses. A remote attacker can send a malicious DNS response containing out-of-bailiwick CNAME records to poison the DNS cache.
Any application using Netty's DNS resolver is impacted.
How to mitigate CVE-2026-45674
Install security update from vendor's website.