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CVE-2026-45674 Netty

Affected softwareNetty
Severity10.0 Critical CVSS 3.1 3 scores
Fixed in4.2.15.Final, 4.1.135.Final
WeaknessCWE-345
Published12 Jun 2026
Updated18 Sep 2026

Description

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 fails to validate the origin (bailiwick) of CNAME records in DNS responses. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CWE-346

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC 1 indexed, none at 5+ stars
  • EPSS 0.29% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

IndexArtifactStarsFirst seen
GitHub PoC CVE-2026-45674 / CVE-2026-47691 / CVE-2026-45673: offline checker for DNS cache poisoning in io.netty:netty-resolver-dns - and whether your app actually uses that resolver. Spring WebClient on Reactor Netty uses it by default, although it is not in your pom.xml. 2026-09-11

Waratek protection

No exploit published

Within Waratek scope. In the sources we check, nobody has published exploit code for this CVE or reported it being exploited.

A public code fix exists.

  • Protection none
  • Action unverified
  • Review automated Upstream data
  • Record active
Decided by Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all
Finding This CVE is not listed in CISA KEV or VulnCheck KEV, CISA Vulnrichment records no active exploitation, no reviewed exploit catalogue carries an entry for it, and no GitHub PoC repository for it has 5 or more stars. Nobody has published exploit code worth tracing, so it is not a candidate for a rule ahead of the ones where somebody has; an upstream fix path does exist, so the remediation half of the candidacy still holds. This is a statement about what has been published, not about whether the defect is reachable or serious.
Candidate fix https://github.com/netty/netty/security/advisories/GHSA-676x-f7gg-47vc : the maintainers' own security advisory: names the version that fixes it, so the fix is the difference between two releases

CVSS

10.0 CRITICAL v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N 3 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 10.0 CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N NVD Primary published
CVSS 3.1 8.7 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N security-advisories@github.com Secondary
CVSS 3.1 8.7 HIGH CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N redhat-SADP Secondary

Affected software and releases

Oracle advisories

AdvisoryTypeQuarterProducts Oracle names in its risk matrix
Oracle Critical Security Patch Update September 2026 ↗ CSPU 2026-Q3 Oracle Communications / Third Party Patch (Netty) (8.0-8.1)

Oracle components and versions

FamilyComponentVersions, as Oracle lists themRead as
Oracle Communications Third Party Patch (Netty) 8.0-8.1

Maven packages

Affected and fixed versions, from OSV.dev
PackageIntroducedFixedLast affected
io.netty:netty-resolver-dns 4.2.0.Final 4.2.15.Final unbounded
io.netty:netty-resolver-dns 0 4.1.135.Final unbounded

Products and versions

2 products, 4 version entries
SourceVendorProductSchemeAffected versions
osv io.netty netty-resolver-dns generic < 4.1.135 · ≥ 4.2.0 and < 4.2.15
nvd netty netty generic < 4.1.135 · ≥ 4.2.0 and < 4.2.15

References

URLTags
https://github.com/netty/netty/security/advisories/GHSA-676x-f7gg-47vc advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45674.json WEB
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final WEB
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final WEB
https://github.com/netty/netty PACKAGE
https://bugzilla.redhat.com/show_bug.cgi?id=2488400 WEB
https://access.redhat.com/security/cve/CVE-2026-45674 WEB
https://access.redhat.com/errata/RHSA-2026:65126 WEB
https://access.redhat.com/errata/RHSA-2026:62260 WEB
https://access.redhat.com/errata/RHSA-2026:54435 WEB

Timeline

Published2026-06-12By the CVE Program.
NVD record modified2026-09-18NVD's own last-modified date for this record.