Vulnerability Database · Maven · io.netty:netty-handler · Version
io.netty:netty-handler 4.2.0.Final
4.2.0.Final is affected by 6 vulnerabilities.
The vulnerabilities that cover this exact version are listed below with the fixed version to move to. The upgrade Vulert recommends: 5.0.0.Alpha2.
Critical 1 High 3 Medium 2 Low 0 Unrated 0
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Released 03 Apr 2025
Licence Apache-2.0
Also known from other sources 5
Newer releases 265
Database updated 23/Oct/2026
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01 Vulnerabilities affecting this version
io.netty:netty-handler 4.2.0.Final vulnerabilities
6 vulnerabilities cover io.netty:netty-handler 4.2.0.Final. Open the full list in the database.
| Vulnerability | Severity | Fixed version | Disclosed |
|---|---|---|---|
| CVE-2026-75595: Netty SNI Routing Bypass via Fragmented TLS ClientHello | 9.1 critical | 4.2.17.Final | 08 Sep 2026 |
| CVE-2026-44249: Netty Handler IPv6 Subnet Filter Bypass Vulnerability | 8.1 high | 4.2.15.Final | 08 Jun 2026 |
| CVE-2026-50010: Netty Handler Package - Hostname Verification Disabled by Trust Manager Wrapping | 7.5 high | 4.2.15.Final | 15 Jun 2026 |
| CVE-2026-45416: Netty Handler Vulnerability Leading to Excessive Memory Allocation | 7.5 high | 4.2.15.Final | 08 Jun 2026 |
| CVE-2026-75596: Netty Handler Vulnerability Leading to Quadratic CPU Consumption | 6.9 medium | 4.2.17.Final | 08 Sep 2026 |
| CVE-2023-4586: Netty-handler does not validate host names by default | 5.3 medium | No fix published | 04 Oct 2023 |
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Questions
About io.netty:netty-handler 4.2.0.Final
Is io.netty:netty-handler 4.2.0.Final vulnerable?
Yes. 6 vulnerabilities in the Vulert database cover io.netty:netty-handler 4.2.0.Final: 1 critical, 3 high, 2 medium and 0 low. The upgrade Vulert recommends is 5.0.0.Alpha2, and each entry above names the fixed version to move to.
Which version of io.netty:netty-handler should I use instead of 4.2.0.Final?
5.0.0.Alpha2 is the version Vulert recommends for this release line. The version table on the package page lists every release with the vulnerabilities recorded against it.
Is 4.2.0.Final the latest release of io.netty:netty-handler?
No. 4.2.0.Final was published 03 Apr 2025, and newer releases exist. Newer is not automatically safer — the version table on the package page shows what each release carries.
How do I monitor io.netty:netty-handler for upcoming vulnerabilities?
Upload the manifest or SBOM for your application at vulert.com/scanner and Vulert keeps checking the io.netty:netty-handler version you actually run against new disclosures, then alerts you when one affects it. There is no installation and no source-code access required.