{"id":"RHLW-2026-1caafb676cc0f4c9","summary":"Lightwell Security Advisory: netty-codec-http2 4.1.100.Final-rhlw-00001","details":"Red Hat Lightwell has released io.netty:netty-codec-http2 4.1.100.Final-rhlw-00001 with backported fixes for CVE-2025-55163, CVE-2026-33871, CVE-2026-42587, CVE-2026-47244, CVE-2026-48043, CVE-2026-50560, CVE-2026-56819, and CVE-2026-59900.\n\nCVE-2025-55163: Netty MadeYouReset HTTP/2 DDoS Vulnerability\n\nCVE-2026-33871: Netty HTTP/2 CONTINUATION Frame Flood DoS via Zero-Byte Frame Bypass\n\nCVE-2026-42587: Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy enables decompression bomb DoS\n\nCVE-2026-47244: Netty HTTP/2: Advertised MAX_CONCURRENT_STREAMS are not enforced\n\nCVE-2026-48043: netty-codec-http2: ByteBuf Reference-Count Leak in DelegatingDecompressorFrameListener Leads to Memory Exhaustion\n\nCVE-2026-50560: Netty susceptible to HTTP/2 Reset Attack with different on-the-wire signature\n\nCVE-2026-56819: Netty: HTTP/2 decompression leaks ByteBuf reference count when the decompressor channel is already closed (Direct memory leak / OOM DoS)\n\nCVE-2026-59900: Netty codec-http2: Lack of Host Header Deduplication in HTTP/2→HTTP/1.x Translation Leads to Request Routing Bypass\n\nThis patched artifact is a drop-in replacement for io.netty:netty-codec-http2 4.1.100.Final from Maven Central.","modified":"2026-10-22T00:08:21.470070644Z","published":"2026-10-12T16:57:35Z","upstream":["CVE-2025-55163","CVE-2026-33871","CVE-2026-42587","CVE-2026-47244","CVE-2026-48043","CVE-2026-50560","CVE-2026-56819","CVE-2026-59900","GHSA-563q-j3cm-6jxm","GHSA-5x3r-wrvg-rp6q","GHSA-93wv-jw9v-4972","GHSA-c2gf-v879-257j","GHSA-c69g-56f8-xwqj","GHSA-f6hv-jmp6-3vwv","GHSA-prj3-ccx8-p6x4","GHSA-w9fj-cfpg-grvv"],"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55163.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-prj3-ccx8-p6x4"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-55163"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-prj3-ccx8-p6x4"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33871.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10175"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:10184"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:13571"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14272"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:14276"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17668"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:17789"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18054"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18055"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:18059"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:22619"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:34608"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:65126"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7109"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:7380"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8159"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:8509"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-33871"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33871.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-w9fj-cfpg-grvv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33871"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-w9fj-cfpg-grvv"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42587.json"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:23808"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:24502"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:25123"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:28010"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:36820"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:37390"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:41951"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:42644"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49700"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:49701"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:50085"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53644"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53645"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:53646"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:54435"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:66488"},{"type":"ADVISORY","url":"https://access.redhat.com/errata/RHSA-2026:66545"},{"type":"ADVISORY","url":"https://access.redhat.com/security/cve/CVE-2026-42587"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42587.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-f6hv-jmp6-3vwv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42587"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-f6hv-jmp6-3vwv"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.1.135.Final"},{"type":"WEB","url":"https://github.com/netty/netty/releases/tag/netty-4.2.15.Final"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/47xxx/CVE-2026-47244.json"},{"type":"ADVISORY","url":"https://github.com/netty/netty/security/advisories/GHSA-5x3r-wrvg-rp6q"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47244"},{"type":"ADVISORY","url":"https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Hat Lightwell:Maven","purl":"pkg:maven/io.netty/netty-codec-http2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.1.100.Final-rhlw-00001"}]}],"versions":["4.1.0.Beta4","4.1.0.Beta5","4.1.0.Beta6","4.1.0.Beta7","4.1.0.Beta8","4.1.0.CR1","4.1.0.CR2","4.1.0.CR3","4.1.0.CR4","4.1.0.CR5","4.1.0.CR6","4.1.0.CR7","4.1.0.Final","4.1.1.Final","4.1.10.Final","4.1.100.Final","4.1.11.Final","4.1.12.Final","4.1.13.Final","4.1.14.Final","4.1.15.Final","4.1.16.Final","4.1.17.Final","4.1.18.Final","4.1.19.Final","4.1.2.Final","4.1.20.Final","4.1.21.Final","4.1.22.Final","4.1.23.Final","4.1.24.Final","4.1.25.Final","4.1.26.Final","4.1.27.Final","4.1.28.Final","4.1.29.Final","4.1.3.Final","4.1.30.Final","4.1.31.Final","4.1.32.Final","4.1.33.Final","4.1.34.Final","4.1.35.Final","4.1.36.Final","4.1.37.Final","4.1.38.Final","4.1.39.Final","4.1.4.Final","4.1.40.Final","4.1.41.Final","4.1.42.Final","4.1.43.Final","4.1.44.Final","4.1.45.Final","4.1.46.Final","4.1.47.Final","4.1.48.Final","4.1.49.Final","4.1.5.Final","4.1.50.Final","4.1.51.Final","4.1.52.Final","4.1.53.Final","4.1.54.Final","4.1.55.Final","4.1.56.Final","4.1.57.Final","4.1.58.Final","4.1.59.Final","4.1.6.Final","4.1.60.Final","4.1.61.Final","4.1.62.Final","4.1.63.Final","4.1.64.Final","4.1.65.Final","4.1.66.Final","4.1.67.Final","4.1.68.Final","4.1.69.Final","4.1.7.Final","4.1.70.Final","4.1.71.Final","4.1.72.Final","4.1.73.Final","4.1.74.Final","4.1.75.Final","4.1.76.Final","4.1.77.Final","4.1.78.Final","4.1.79.Final","4.1.8.Final","4.1.80.Final","4.1.81.Final","4.1.82.Final","4.1.83.Final","4.1.84.Final","4.1.85.Final","4.1.86.Final","4.1.87.Final","4.1.88.Final","4.1.89.Final","4.1.9.Final","4.1.90.Final","4.1.91.Final","4.1.92.Final","4.1.93.Final","4.1.94.Final","4.1.95.Final","4.1.96.Final","4.1.97.Final","4.1.98.Final","4.1.99.Final"],"database_specific":{"lightwell":{"repository_url":"https://packages.redhat.com/lightwell/java/remediated/","backport_base_version":"4.1.100.Final","remediated_version":"4.1.100.Final-rhlw-00001"},"source":"https://github.com/project-lightwell/lightwell-osv/blob/main/advisories/RHLW-2026-1caafb676cc0f4c9.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}],"credits":[{"name":"Red Hat Lightwell","type":"REMEDIATION_DEVELOPER"}]}