Insufficient Verification of Data Authenticity Affecting netty package, versions *


Severity

Recommended
0.0
critical
0
10

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Threat Intelligence

EPSS
0.24% (15th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-NETTY-17328744
  • published13 Jun 2026
  • disclosed12 Jun 2026

Introduced: 12 Jun 2026

NewCVE-2026-47691  (opens in a new tab)
CWE-345  (opens in a new tab)

How to fix?

There is no fixed version for Debian:unstable netty.

NVD Description

Note: Versions mentioned in the description apply only to the upstream netty package and not the netty package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DnsResolveContext insufficiently validates the bailiwick of NS records, enabling DNS Cache Poisoning. An attacker controlling an authoritative name server for a subdomain can poison the cache for parent domains (like .co.uk). In io.netty.resolver.dns.DnsResolveContext.AuthoritativeNameServerList#add method accepts any NS record from the AUTHORITY section as long as the record's name is a suffix of the questionName. Subsequently, the handleWithAdditional method caches the associated A records from the ADDITIONAL section directly into the authoritativeDnsServerCache under the parent domain's key. This bypasses standard bailiwick rules, where a server authoritative for a subdomain should not be trusted to provide authoritative records for its parent. The poisoned cache is then used for all future resolutions under the parent domain's key. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS Base Scores

version 3.1