# Netty Project Netty Codec HTTP vulnerabilities Source: https://junglewise.ai/threats/technologies/codec-http 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-http.json License: CC BY 4.0 with a link back Junglewise Threat Intelligence has tracked 12 vulnerabilities in Netty Project Netty Codec HTTP: 0 in the last 7 days and 1 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-100666, was published on 26 September 2026. Nothing in the last four weeks, down from 1 vulnerability in the four before. ## Counts - Last 7 days: 0 - Last 30 days: 0 - Last 90 days: 1 - All time: 12 (0 critical, 0 exploited in the wild) ## About Netty Project Netty Codec HTTP HTTP codec component of Netty providing HTTP protocol encoding and decoding for HTTP/1.x messages. ## Latest Netty Project Netty Codec HTTP vulnerabilities - [CVE-2026-100666: Netty HttpServerCodec response desynchronization](https://junglewise.ai/threats/cve-2026-100666-netty-s-httpservercodec-io-netty-netty-codec-http-in-versions-4) (high, CVSS 7.3, published 26 Sep 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) ## Most severe Netty Project 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-2026-55833: 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-2026-42584: Netty HttpClientCodec response desynchronization](https://junglewise.ai/threats/cve-2026-42584-netty-httpclientcodec-response-desynchronization) (high, CVSS 7.3, published 13 May 2026) - [CVE-2026-100666: Netty HttpServerCodec response desynchronization](https://junglewise.ai/threats/cve-2026-100666-netty-s-httpservercodec-io-netty-netty-codec-http-in-versions-4) (high, CVSS 7.3, published 26 Sep 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-2026-42585: 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-2026-42581: 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-2026-59921: 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) ## Vulnerabilities per week Nothing in the last four weeks, down from 1 vulnerability 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 | 1 | 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 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 Codec HTTP3](https://junglewise.ai/threats/technologies/codec-http3): 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 HTTP vulnerabilities", https://junglewise.ai/threats/technologies/codec-http, 11 November 2026.