CVE-2026-45674
HIGH 8.7Netty 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.
Severe if exploited (CVSS 8.7), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.2%chance of exploitation in 30 days · 13th percentile
Impact if exploited
8.7CVSS 3.1 · HIGH
- ConfidentialityHigh
- IntegrityHigh
- AvailabilityNone
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ⚠Complexity: Needs a race window or specific setup
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept & exploit code
- github-search Search GitHub for public PoC repos
Test against your own equipment
curl -s https://vulnpedia.com/cve/CVE-2026-45674/poc.jsonMachine-readable PoC index for this CVE (for automation).Listed for defensive triage, patch verification, and authorized testing on systems you own. Machine-readable: /cve/CVE-2026-45674/poc.json
Affected
Products Netty Red Hat Build Of Apache Camel 3.33 For Quarkus 3.33.2.Sp1 Red Hat Build Of Apache Camel 4.18.1.P1 For Spring Boot 3.5.16 Red Hat Build Of Quarkus 3.27.4.Sp1 Red Hat Build Of Quarkus 3.33.2.Sp1 Red Hat Data Grid 8.6.2 Streams For Apache Kafka 2.9.4 Cryostat 4 Openshift Serverless Red Hat Build Of Apache Camel 4 For Quarkus 3 Red Hat Build Of Apache Camel Hawtio 4 Red Hat Build Of Apicurio Registry 3
Weakness (CWE)
- CWE-345: : Insufficient Verification of Data Authenticity
- CWE-346: Origin Validation Error
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
Known Affected Software Configurations
| Vendor | Product | Version range |
|---|---|---|
| Netty | Netty | < 4.1.135 |
| Netty | Netty | ≥ 4.2.0 and < 4.2.15 |
All CVSS metrics
- HIGH 8.7 v3.1 · CNA Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N - HIGH 8.7 v3.1 · ADP Primary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N - HIGH 8.7 v3.1 · NVD Secondary
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N - CRITICAL 10 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
References
Advisories
- https://github.com/netty/netty/security/advisories/GHSA-676x-f7gg-47vc
- https://access.redhat.com/errata/RHSA-2026:26586
- https://access.redhat.com/errata/RHSA-2026:41951
- https://access.redhat.com/errata/RHSA-2026:37390
- https://access.redhat.com/errata/RHSA-2026:26018
- https://access.redhat.com/errata/RHSA-2026:26017
- https://access.redhat.com/errata/RHSA-2026:34608
Technical & other
- https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
- https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
- https://access.redhat.com/security/cve/CVE-2026-45674
- https://bugzilla.redhat.com/show_bug.cgi?id=2488400
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45674.json