# io.netty:netty-codec-http2 (Maven) vulnerabilities

Source: https://junglewise.ai/threats/technologies/io-netty-netty-codec-http2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/io-netty-netty-codec-http2.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 11 vulnerabilities in io.netty:netty-codec-http2 (Maven): 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-59900, was published on 29 July 2026.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 11 (0 critical, 0 exploited in the wild)

## About io.netty:netty-codec-http2 (Maven)

Netty codec module for HTTP/2 protocol support.

## Latest io.netty:netty-codec-http2 (Maven) vulnerabilities

- [CVE-2026-59900: Netty request smuggling via Host header duplication in HTTP/2 translation](https://junglewise.ai/threats/cve-2026-59900-netty-request-smuggling-via-host-header-duplication-in-http-2) (medium, CVSS 4, published 29 Jul 2026)
- [CVE-2026-56819: Netty memory leak in HTTP/2 content decompression](https://junglewise.ai/threats/cve-2026-56819-netty-memory-leak-in-http-2-content-decompression) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-50560: Netty denial of service in HTTP/2 codec via max header size handling](https://junglewise.ai/threats/cve-2026-50560-netty-denial-of-service-in-http-2-codec-via-max-header-size) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-48043: Netty memory exhaustion in DelegatingDecompressorFrameListener](https://junglewise.ai/threats/cve-2026-48043-netty-memory-exhaustion-in-delegatingdecompressorframelistener) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-47244: Netty uncontrolled resource consumption in HTTP/2 codec](https://junglewise.ai/threats/cve-2026-47244-netty-uncontrolled-resource-consumption-in-http-2-codec) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-42587: Netty denial of service via decompression limit bypass](https://junglewise.ai/threats/cve-2026-42587-netty-denial-of-service-via-decompression-limit-bypass) (high, CVSS 7.5, published 13 May 2026)
- [CVE-2026-33871: Netty Denial of Service via HTTP/2 CONTINUATION frame flood](https://junglewise.ai/threats/cve-2026-33871-netty-denial-of-service-via-http-2-continuation-frame-flood) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2025-55163: Netty affected by MadeYouReset HTTP/2 DDoS vulnerability](https://junglewise.ai/threats/cve-2025-55163-netty-affected-by-madeyoureset-http-2-ddos-vulnerability) (low, CVSS 3.1, published 13 Aug 2025)
- [io.netty:netty-codec-http2 vulnerable to HTTP/2 Rapid Reset Attack](https://junglewise.ai/threats/io-netty-netty-codec-http2-vulnerable-to-http-2-rapid-reset-attack-e10c4f89) (low, CVSS 3.1, published 10 Oct 2023)
- [CVE-2021-21409: Possible request smuggling in HTTP/2 due missing validation of content-length](https://junglewise.ai/threats/cve-2021-21409-possible-request-smuggling-in-http-2-due-missing-validation-of) (low, CVSS 3.1, published 30 Mar 2021)
- [CVE-2021-21295: Possible request smuggling in HTTP/2 due missing validation](https://junglewise.ai/threats/cve-2021-21295-possible-request-smuggling-in-http-2-due-missing-validation) (low, CVSS 3.1, published 9 Mar 2021)

## Most severe io.netty:netty-codec-http2 (Maven) vulnerabilities

- [CVE-2026-33871: Netty Denial of Service via HTTP/2 CONTINUATION frame flood](https://junglewise.ai/threats/cve-2026-33871-netty-denial-of-service-via-http-2-continuation-frame-flood) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2026-42587: Netty denial of service via decompression limit bypass](https://junglewise.ai/threats/cve-2026-42587-netty-denial-of-service-via-decompression-limit-bypass) (high, CVSS 7.5, published 13 May 2026)
- [CVE-2026-56819: Netty memory leak in HTTP/2 content decompression](https://junglewise.ai/threats/cve-2026-56819-netty-memory-leak-in-http-2-content-decompression) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-48043: Netty memory exhaustion in DelegatingDecompressorFrameListener](https://junglewise.ai/threats/cve-2026-48043-netty-memory-exhaustion-in-delegatingdecompressorframelistener) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-50560: Netty denial of service in HTTP/2 codec via max header size handling](https://junglewise.ai/threats/cve-2026-50560-netty-denial-of-service-in-http-2-codec-via-max-header-size) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-47244: Netty uncontrolled resource consumption in HTTP/2 codec](https://junglewise.ai/threats/cve-2026-47244-netty-uncontrolled-resource-consumption-in-http-2-codec) (medium, CVSS 5.3, published 12 Jun 2026)
- [CVE-2026-59900: Netty request smuggling via Host header duplication in HTTP/2 translation](https://junglewise.ai/threats/cve-2026-59900-netty-request-smuggling-via-host-header-duplication-in-http-2) (medium, CVSS 4, published 29 Jul 2026)
- [CVE-2021-21295: Possible request smuggling in HTTP/2 due missing validation](https://junglewise.ai/threats/cve-2021-21295-possible-request-smuggling-in-http-2-due-missing-validation) (low, CVSS 3.1, published 9 Mar 2021)
- [CVE-2021-21409: Possible request smuggling in HTTP/2 due missing validation of content-length](https://junglewise.ai/threats/cve-2021-21409-possible-request-smuggling-in-http-2-due-missing-validation-of) (low, CVSS 3.1, published 30 Mar 2021)
- [CVE-2025-55163: Netty affected by MadeYouReset HTTP/2 DDoS vulnerability](https://junglewise.ai/threats/cve-2025-55163-netty-affected-by-madeyoureset-http-2-ddos-vulnerability) (low, CVSS 3.1, published 13 Aug 2025)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 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-codec-http2 (Maven) vulnerabilities", https://junglewise.ai/threats/technologies/io-netty-netty-codec-http2, 11 November 2026.