GHSA-676x-f7gg-47vc - Vulnerability details

8.7/10

CVSS 3.1

GHSA-676x-f7gg-47vc

resolved Published 2026-06-08 Updated 2026-09-18

GitHub Advisory

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Vulnerability Data from Dependency-Track

Affected versions

5.7

5.7.2 5.7.1 5.7.0

5.6

5.6.8 5.6.7 5.6.6 5.6.5 5.6.4 5.6.3 5.6.2 5.6.1 5.6.0

5.5

5.5.19 5.5.18 5.5.17 5.5.16 5.5.15 5.5.14 5.5.13 5.5.12 5.5.11 5.5.10 5.5.9 5.5.8 5.5.7 5.5.6 5.5.5 5.5.4 5.5.3 5.5.2 5.5.1 5.5.0

5.4

5.4.13 5.4.12 5.4.11 5.4.10 5.4.9 5.4.8 5.4.7 5.4.6 5.4.5 5.4.4 5.4.3 5.4.2 5.4.1 5.4.0

Fixed in version 5.7.3 No fix yet in 5.6, 5.5, 5.4

Score

8.7 CVSS 3.1 GITHUB CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Description

### 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.

Same vulnerability as

CVE-2026-45674 resolved according to EUVD-2026-36450

Analysis Read only

State

Justification

Recommandation

Workaround

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