CVSS 3.1
9.1 criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:HCVE-2026-42579
Critical (9.1) in netty netty. EPSS 1.0% chance of exploitation in the next 30 days. Fixed in io.netty:netty-codec-dns 4.1.133.Final, 4.2.13.Final.
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 63% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-20, CWE-400, CWE-626, CWE-1286
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netty:netty
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-cm33-6792-r9fm | Maven | io.netty:netty-codec-dns | >=4.2.0.Alpha1 <4.2.13.Final | 4.2.13.Final |
| GHSA-cm33-6792-r9fm | Maven | io.netty:netty-codec-dns | <4.1.133.Final | 4.1.133.Final |