# Netty-Codec-Http vulnerabilities

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

Junglewise Threat Intelligence has tracked 18 vulnerabilities in Netty-Codec-Http: 0 in the last 7 days and 4 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-100658, was published on 26 September 2026. Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 4
- All time: 18 (0 critical, 0 exploited in the wild)

## About Netty-Codec-Http

Java library providing HTTP/1.1 and HTTP/2 protocol codec implementations for Netty.

## Latest Netty-Codec-Http vulnerabilities

- [CVE-2026-100658: Netty unbounded queue denial of service in WebSocketServerExtensionHandler](https://junglewise.ai/threats/cve-2026-100658-netty-io-netty-netty-codec-http-contains-an-unbounded-per) (medium, CVSS 5.3, published 26 Sep 2026)
- [CVE-2026-100656: Netty HttpServerCodec unbounded queue growth via HTTP/1.1 pipelining](https://junglewise.ai/threats/cve-2026-100656-netty-io-netty-netty-codec-http-contains-an-unbounded-per) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-100655: Netty netty-codec-http denial of service in SpdySessionHandler](https://junglewise.ai/threats/cve-2026-100655-netty-io-netty-netty-codec-http-versions-up-to-and-including-4-1) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-59903: Netty CorsHandler cache poisoning via Vary header overwrite](https://junglewise.ai/threats/cve-2026-59903-netty-corshandler-cache-poisoning-via-vary-header-overwrite) (medium, CVSS 6.5, published 17 Aug 2026)
- [CVE-2026-59898: Netty HTTP request smuggling via lax WebSocket handshake validation](https://junglewise.ai/threats/cve-2026-59898-netty-http-request-smuggling-via-lax-websocket-handshake) (medium, CVSS 4, published 29 Jul 2026)
- [CVE-2026-59899: Netty resource exhaustion in HttpContentEncoder via HTTP pipelining](https://junglewise.ai/threats/cve-2026-59899-netty-resource-exhaustion-in-httpcontentencoder-via-http) (medium, CVSS 4, published 29 Jul 2026)
- [CVE-2026-59921: Netty CRLF injection in HttpPostRequestEncoder multipart filenames](https://junglewise.ai/threats/cve-2026-59921-netty-crlf-injection-in-httppostrequestencoder-multipart) (medium, CVSS 5.7, published 28 Jul 2026)
- [CVE-2026-56746: Netty security bypass in CorsHandler origin evaluation](https://junglewise.ai/threats/cve-2026-56746-netty-security-bypass-in-corshandler-origin-evaluation) (medium, CVSS 6.5, published 21 Jul 2026)
- [CVE-2026-56745: Netty memory leak in SpdyHttpDecoder leading to DoS](https://junglewise.ai/threats/cve-2026-56745-netty-memory-leak-in-spdyhttpdecoder-leading-to-dos) (high, CVSS 4, published 21 Jul 2026)
- [CVE-2026-55833: Netty resource exhaustion in SPDY header decoding](https://junglewise.ai/threats/cve-2026-55833-netty-resource-exhaustion-in-spdy-header-decoding) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-55831: Netty resource exhaustion in SPDY SETTINGS decoder](https://junglewise.ai/threats/cve-2026-55831-netty-resource-exhaustion-in-spdy-settings-decoder) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-50020: Netty HTTP request smuggling in HttpObjectDecoder](https://junglewise.ai/threats/cve-2026-50020-netty-http-request-smuggling-in-httpobjectdecoder) (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-2026-42585: Netty HTTP request smuggling via malformed Transfer-Encoding](https://junglewise.ai/threats/cve-2026-42585-netty-http-request-smuggling-via-malformed-transfer-encoding) (medium, CVSS 6.5, published 13 May 2026)
- [CVE-2026-42584: Netty HttpClientCodec response desynchronization](https://junglewise.ai/threats/cve-2026-42584-netty-httpclientcodec-response-desynchronization) (high, CVSS 7.3, published 13 May 2026)
- [CVE-2026-42581: Netty HTTP request smuggling in HttpObjectDecoder](https://junglewise.ai/threats/cve-2026-42581-netty-http-request-smuggling-in-httpobjectdecoder) (medium, CVSS 5.8, published 13 May 2026)
- [CVE-2026-42580: Netty integer overflow in HTTP chunk size parser](https://junglewise.ai/threats/cve-2026-42580-netty-integer-overflow-in-http-chunk-size-parser) (medium, CVSS 6.5, published 13 May 2026)
- [CVE-2026-33870: Netty request smuggling via chunked extension quoted-string parsing](https://junglewise.ai/threats/cve-2026-33870-netty-request-smuggling-via-chunked-extension-quoted-string) (high, CVSS 7.5, published 27 Mar 2026)

## Most severe Netty-Codec-Http vulnerabilities

- [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-2026-33870: Netty request smuggling via chunked extension quoted-string parsing](https://junglewise.ai/threats/cve-2026-33870-netty-request-smuggling-via-chunked-extension-quoted-string) (high, CVSS 7.5, published 27 Mar 2026)
- [CVE-2026-55833: Netty resource exhaustion in SPDY header decoding](https://junglewise.ai/threats/cve-2026-55833-netty-resource-exhaustion-in-spdy-header-decoding) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-55831: Netty resource exhaustion in SPDY SETTINGS decoder](https://junglewise.ai/threats/cve-2026-55831-netty-resource-exhaustion-in-spdy-settings-decoder) (high, CVSS 7.5, published 21 Jul 2026)
- [CVE-2026-100656: Netty HttpServerCodec unbounded queue growth via HTTP/1.1 pipelining](https://junglewise.ai/threats/cve-2026-100656-netty-io-netty-netty-codec-http-contains-an-unbounded-per) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-100655: Netty netty-codec-http denial of service in SpdySessionHandler](https://junglewise.ai/threats/cve-2026-100655-netty-io-netty-netty-codec-http-versions-up-to-and-including-4-1) (high, CVSS 7.5, published 26 Sep 2026)
- [CVE-2026-42584: Netty HttpClientCodec response desynchronization](https://junglewise.ai/threats/cve-2026-42584-netty-httpclientcodec-response-desynchronization) (high, CVSS 7.3, published 13 May 2026)
- [CVE-2026-56745: Netty memory leak in SpdyHttpDecoder leading to DoS](https://junglewise.ai/threats/cve-2026-56745-netty-memory-leak-in-spdyhttpdecoder-leading-to-dos) (high, CVSS 4, published 21 Jul 2026)
- [CVE-2026-56746: Netty security bypass in CorsHandler origin evaluation](https://junglewise.ai/threats/cve-2026-56746-netty-security-bypass-in-corshandler-origin-evaluation) (medium, CVSS 6.5, published 21 Jul 2026)
- [CVE-2026-42580: Netty integer overflow in HTTP chunk size parser](https://junglewise.ai/threats/cve-2026-42580-netty-integer-overflow-in-http-chunk-size-parser) (medium, CVSS 6.5, published 13 May 2026)

## Vulnerabilities per week

Nothing in the last four weeks, down from 3 vulnerabilities in the four before.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 1 | 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 | 3 | 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 technologies

- [Netty](https://junglewise.ai/threats/technologies/netty): 25 vulnerabilities
- [Netty-Handler](https://junglewise.ai/threats/technologies/netty-handler): 5 vulnerabilities
- [Netty Codec HTTP/3](https://junglewise.ai/threats/technologies/codec-http-3): 4 vulnerabilities
- [Netty-Codec-Http3](https://junglewise.ai/threats/technologies/netty-codec-http3): 4 vulnerabilities
- [Netty TCNative](https://junglewise.ai/threats/technologies/tcnative): 4 vulnerabilities
- [Netty-Resolver-Dns](https://junglewise.ai/threats/technologies/netty-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-Codec-Http vulnerabilities", https://junglewise.ai/threats/technologies/netty-netty-codec-http, 9 November 2026.