GHSA-676x-f7gg-47vc

    Dashboard / Vulnerabilities / GHSA-676x-f7gg-47vc

    GHSA-676x-f7gg-47vc

    Published: 8 Jun 2026Last Modified: 18 Sept 2026

    Summary: Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records

    Details: ### Summary Netty's DnsResolveContext fails to validate the origin (bailiwick) of CNAME records in DNS responses. ### Details 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. ``` ### Impact DNS Cache Poisoning (Bailiwick Bypass). Any application using Netty's DNS resolver is impacted.

    References: https://github.com/netty/netty/security/advisories/GHSA-676x-f7gg-47vc, https://nvd.nist.gov/vuln/detail/CVE-2026-45674, https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45674.json, https://github.com/netty/netty/releases/tag/netty-4.2.15.Final, https://github.com/netty/netty/releases/tag/netty-4.1.135.Final, https://github.com/netty/netty, https://bugzilla.redhat.com/show_bug.cgi?id=2488400, https://access.redhat.com/security/cve/CVE-2026-45674, https://access.redhat.com/errata/RHSA-2026:65126, https://access.redhat.com/errata/RHSA-2026:62260, https://access.redhat.com/errata/RHSA-2026:54435, https://access.redhat.com/errata/RHSA-2026:53806, https://access.redhat.com/errata/RHSA-2026:53646, https://access.redhat.com/errata/RHSA-2026:53645, https://access.redhat.com/errata/RHSA-2026:53644, https://access.redhat.com/errata/RHSA-2026:50085, https://access.redhat.com/errata/RHSA-2026:49701, https://access.redhat.com/errata/RHSA-2026:49700, https://access.redhat.com/errata/RHSA-2026:48151, https://access.redhat.com/errata/RHSA-2026:41951, https://access.redhat.com/errata/RHSA-2026:37390, https://access.redhat.com/errata/RHSA-2026:34608, https://access.redhat.com/errata/RHSA-2026:26586, https://access.redhat.com/errata/RHSA-2026:26018, https://access.redhat.com/errata/RHSA-2026:26017

    Affected packages

    Package

    Name: io.netty:netty-resolver-dns

    Purl: pkg:maven/io.netty/netty-resolver-dns

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 4.2.0.Final
    Fixed -4.2.15.Final

    Affected versions

    4.2.0.Final
    4.2.1.Final
    4.2.10.Final
    4.2.11.Final
    4.2.12.Final
    4.2.13.Final
    4.2.14.Final
    4.2.2.Final
    4.2.3.Final
    4.2.4.Final
    4.2.5.Final
    4.2.6.Final
    4.2.7.Final
    4.2.8.Final
    4.2.9.Final

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-676x-f7gg-47vc | CVE-DB