# io.netty:netty-handler (Maven) vulnerabilities

Source: https://junglewise.ai/threats/technologies/io-netty-netty-handler  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/io-netty-netty-handler.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 13 vulnerabilities in io.netty:netty-handler (Maven): 0 in the last 7 days and 2 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-75596, was published on 19 August 2026. Nothing was published in the last eight weeks.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 2
- All time: 13 (1 critical, 0 exploited in the wild)

## About io.netty:netty-handler (Maven)

A Netty ecosystem component providing SSL/TLS and other data security handlers for network applications.

## Latest io.netty:netty-handler (Maven) vulnerabilities

- [CVE-2026-75596: Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default…](https://junglewise.ai/threats/cve-2026-75596-netty-quadratic-pre-handshake-clienthello-reassembly-in-sni) (high, CVSS 7.5, published 19 Aug 2026)
- [CVE-2026-75595: Netty SNI routing bypass via fragmented TLS ClientHello](https://junglewise.ai/threats/cve-2026-75595-netty-sni-routing-bypass-via-fragmented-tls-clienthello) (critical, CVSS 9.1, published 19 Aug 2026)
- [CVE-2026-50010: Netty disabled TLS hostname verification in netty-handler](https://junglewise.ai/threats/cve-2026-50010-netty-disabled-tls-hostname-verification-in-netty-handler) (high, CVSS 7.5, published 12 Jun 2026)
- [CVE-2026-45416: Netty excessive memory allocation in SNIHandler](https://junglewise.ai/threats/cve-2026-45416-netty-excessive-memory-allocation-in-snihandler) (high, CVSS 7.5, published 12 Jun 2026)
- [CVE-2026-44249: Netty IPv6 subnet filter bypass in netty-handler](https://junglewise.ai/threats/cve-2026-44249-netty-ipv6-subnet-filter-bypass-in-netty-handler) (high, CVSS 8.1, published 11 Jun 2026)
- [CVE-2025-24970: SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine](https://junglewise.ai/threats/cve-2025-24970-sslhandler-doesn-t-correctly-validate-packets-which-can-lead-to) (low, CVSS 3.1, published 10 Feb 2025)
- [CVE-2023-4586: Withdrawn Advisory: Netty-handler does not validate host names by default](https://junglewise.ai/threats/cve-2023-4586-withdrawn-advisory-netty-handler-does-not-validate-host-names-by) (low, CVSS 3.1, published 4 Oct 2023)
- [CVE-2023-34462: netty-handler SniHandler 16MB allocation](https://junglewise.ai/threats/cve-2023-34462-netty-handler-snihandler-16mb-allocation) (low, CVSS 3.1, published 20 Jun 2023)
- [CVE-2016-4970: Loop with Unreachable Exit Condition in Netty](https://junglewise.ai/threats/cve-2016-4970-loop-with-unreachable-exit-condition-in-netty) (low, CVSS 3.1, published 13 May 2022)
- [CVE-2014-3488: Denial of service in Netty](https://junglewise.ai/threats/cve-2014-3488-denial-of-service-in-netty) (info, published 30 Jun 2020)
- [CVE-2020-11612: Denial of Service in Netty](https://junglewise.ai/threats/cve-2020-11612-denial-of-service-in-netty) (low, CVSS 3.1, published 15 Jun 2020)
- [CVE-2020-7238: HTTP Request Smuggling in Netty](https://junglewise.ai/threats/cve-2020-7238-http-request-smuggling-in-netty) (low, CVSS 3.1, published 21 Feb 2020)
- [CVE-2019-20445: HTTP Request Smuggling in Netty](https://junglewise.ai/threats/cve-2019-20445-http-request-smuggling-in-netty) (info, published 21 Feb 2020)

## Most severe io.netty:netty-handler (Maven) vulnerabilities

- [CVE-2026-75595: Netty SNI routing bypass via fragmented TLS ClientHello](https://junglewise.ai/threats/cve-2026-75595-netty-sni-routing-bypass-via-fragmented-tls-clienthello) (critical, CVSS 9.1, published 19 Aug 2026)
- [CVE-2026-44249: Netty IPv6 subnet filter bypass in netty-handler](https://junglewise.ai/threats/cve-2026-44249-netty-ipv6-subnet-filter-bypass-in-netty-handler) (high, CVSS 8.1, published 11 Jun 2026)
- [CVE-2026-45416: Netty excessive memory allocation in SNIHandler](https://junglewise.ai/threats/cve-2026-45416-netty-excessive-memory-allocation-in-snihandler) (high, CVSS 7.5, published 12 Jun 2026)
- [CVE-2026-50010: Netty disabled TLS hostname verification in netty-handler](https://junglewise.ai/threats/cve-2026-50010-netty-disabled-tls-hostname-verification-in-netty-handler) (high, CVSS 7.5, published 12 Jun 2026)
- [CVE-2026-75596: Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Final and 4.2.17.Final, the default…](https://junglewise.ai/threats/cve-2026-75596-netty-quadratic-pre-handshake-clienthello-reassembly-in-sni) (high, CVSS 7.5, published 19 Aug 2026)
- [CVE-2016-4970: Loop with Unreachable Exit Condition in Netty](https://junglewise.ai/threats/cve-2016-4970-loop-with-unreachable-exit-condition-in-netty) (low, CVSS 3.1, published 13 May 2022)
- [CVE-2020-11612: Denial of Service in Netty](https://junglewise.ai/threats/cve-2020-11612-denial-of-service-in-netty) (low, CVSS 3.1, published 15 Jun 2020)
- [CVE-2020-7238: HTTP Request Smuggling in Netty](https://junglewise.ai/threats/cve-2020-7238-http-request-smuggling-in-netty) (low, CVSS 3.1, published 21 Feb 2020)
- [CVE-2023-34462: netty-handler SniHandler 16MB allocation](https://junglewise.ai/threats/cve-2023-34462-netty-handler-snihandler-16mb-allocation) (low, CVSS 3.1, published 20 Jun 2023)
- [CVE-2025-24970: SslHandler doesn't correctly validate packets which can lead to native crash when using native SSLEngine](https://junglewise.ai/threats/cve-2025-24970-sslhandler-doesn-t-correctly-validate-packets-which-can-lead-to) (low, CVSS 3.1, published 10 Feb 2025)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 2 | 1 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

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## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "io.netty:netty-handler (Maven) vulnerabilities", https://junglewise.ai/threats/technologies/io-netty-netty-handler, 9 November 2026.