# Netty Project Netty Codec HTTP3 vulnerabilities

Source: https://junglewise.ai/threats/technologies/codec-http3  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 11 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/technologies/codec-http3.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 3 vulnerabilities in Netty Project Netty Codec HTTP3: 0 in the last 7 days and 2 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-100664, was published on 26 September 2026. Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 2
- All time: 3 (0 critical, 0 exploited in the wild)

## About Netty Project Netty Codec HTTP3

Netty library that provides HTTP/3 protocol encoding and decoding functionality.

## Latest Netty Project Netty Codec HTTP3 vulnerabilities

- [CVE-2026-100664: Netty HTTP/3 codec Host header authority confusion](https://junglewise.ai/threats/cve-2026-100664-netty-s-http-3-codec-io-netty-netty-codec-http3-versions-4-2-2) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-100659: Netty HTTP/3 codec host header validation bypass](https://junglewise.ai/threats/cve-2026-100659-netty-s-http-3-codec-io-netty-netty-codec-http3-in-versions-4-2) (medium, CVSS 6.5, published 26 Sep 2026)
- [CVE-2026-42582: Netty unbounded memory allocation in HTTP/3 QPACK decoder](https://junglewise.ai/threats/cve-2026-42582-netty-unbounded-memory-allocation-in-http-3-qpack-decoder) (high, CVSS 7.5, published 13 May 2026)

## Most severe Netty Project Netty Codec HTTP3 vulnerabilities

- [CVE-2026-42582: Netty unbounded memory allocation in HTTP/3 QPACK decoder](https://junglewise.ai/threats/cve-2026-42582-netty-unbounded-memory-allocation-in-http-3-qpack-decoder) (high, CVSS 7.5, published 13 May 2026)
- [CVE-2026-100664: Netty HTTP/3 codec Host header authority confusion](https://junglewise.ai/threats/cve-2026-100664-netty-s-http-3-codec-io-netty-netty-codec-http3-versions-4-2-2) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-100659: Netty HTTP/3 codec host header validation bypass](https://junglewise.ai/threats/cve-2026-100659-netty-s-http-3-codec-io-netty-netty-codec-http3-in-versions-4-2) (medium, CVSS 6.5, published 26 Sep 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 2 vulnerabilities in the four before.

| 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 | 2 | 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 |

## Other Netty Project technologies

- [Netty Project Netty](https://junglewise.ai/threats/technologies/netty-project-netty): 16 vulnerabilities
- [Netty Project Netty Codec HTTP](https://junglewise.ai/threats/technologies/codec-http): 12 vulnerabilities
- [Netty Project Netty Codec Redis](https://junglewise.ai/threats/technologies/codec-redis): 5 vulnerabilities
- [Netty Project Netty Incubator Codec OHTTP](https://junglewise.ai/threats/technologies/incubator-codec-ohttp): 4 vulnerabilities
- [Netty Project Netty netty-codec-http2](https://junglewise.ai/threats/technologies/netty-codec-http2): 4 vulnerabilities
- [Netty Project Netty Codec HAProxy](https://junglewise.ai/threats/technologies/codec-haproxy): 3 vulnerabilities
- [Netty Project Netty Handler SSL OCSP](https://junglewise.ai/threats/technologies/netty-handler-ssl-ocsp): 3 vulnerabilities
- [Netty Project Netty Resolver DNS](https://junglewise.ai/threats/technologies/resolver-dns): 3 vulnerabilities

## 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, "Netty Project Netty Codec HTTP3 vulnerabilities", https://junglewise.ai/threats/technologies/codec-http3, 11 November 2026.