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Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

Type: advisorySources: OSV

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-42585
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 20:24 UTC · Revision 1

Source evidence

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

core-osv · Original source

Published 13 May 2026, 18:12 UTC

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

osv:CVE-2026-42585
Complete source record
{
  "id": "233058240274c7e40ca750dcbcf49be852783552d5c44cee640c1451ce1d963f",
  "url": "https://osv.dev/vulnerability/CVE-2026-42585",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Netty: HTTP Request Smuggling due to malformed Transfer-Encoding",
    "summary": "Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty incorrectly parses malformed Transfer-Encoding, enabling request smuggling attacks. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.",
    "evidence": "osv:CVE-2026-42585",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-42585",
      "aliases": [
        "CVE-2026-42585",
        "GHSA-38f8-5428-x5cv"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/netty/netty",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "fb13125f135ab53203513ff603872a3abe84d38d"
                },
                {
                  "introduced": "09e64d259c99be8b5b2a471a78f11e65eb82598a"
                },
                {
                  "fixed": "b3844c8108b42f68d56144b36d4d1ed96078a688"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "4.1.133"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "4.2.0"
                      },
                      {
                        "fixed": "4.2.13"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "netty-4.2.12.Final",
            "netty-4.1.132.Final",
            "netty-4.2.11.Final",
            "netty-4.1.131.Final",
            "netty-4.2.10.Final",
            "netty-4.2.9.Final",
            "netty-4.1.130.Final",
            "netty-4.2.8.Final",
            "netty-4.1.129.Final",
            "netty-4.1.128.Final",
            "netty-4.2.7.Final",
            "netty-4.2.6.Final",
            "netty-4.1.127.Final",
            "netty-4.2.5.Final",
            "netty-4.1.126.Final",
            "netty-4.1.125.Final",
            "netty-4.2.4.Final",
            "netty-4.1.124.Final",
            "netty-4.1.123.Final",
            "netty-4.2.3.Final",
            "netty-4.2.2.Final",
            "netty-4.1.122.Final",
            "netty-4.2.1.Final",
            "netty-4.1.121.Final",
            "netty-4.1.120.Final",
            "netty-4.2.0.Final",
            "netty-4.1.119.Final",
            "netty-4.1.118.Final",
            "netty-4.1.117.Final",
            "netty-4.1.116.Final",
            "netty-4.1.115.Final",
            "netty-4.1.114.Final",
            "netty-4.1.113.Final",
            "netty-4.1.112.Final",
            "netty-4.1.111.Final",
            "netty-4.1.110.Final",
            "netty-4.1.109.Final",
            "netty-4.1.108.Final",
            "netty-4.1.107.Final",
            "netty-4.1.106.Final",
            "netty-4.1.105.Final",
            "netty-4.1.104.Final",
            "netty-4.1.103.Final",
            "netty-4.1.102.Final",
            "netty-4.1.101.Final",
            "netty-4.1.100.Final",
            "netty-4.1.99.Final",
            "netty-4.1.98.Final",
            "netty-4.1.97.Final",
            "netty-4.1.96.Final",
            "netty-4.1.95.Final",
            "netty-4.1.94.Final",
            "netty-4.1.93.Final",
            "netty-4.1.92.Final",
            "netty-4.1.91.Final",
            "netty-4.1.90.Final",
            "netty-4.1.89.Final",
            "netty-4.1.88.Final",
            "netty-4.1.87.Final",
            "netty-4.1.86.Final",
            "netty-4.1.85.Final",
            "netty-4.1.84.Final",
            "netty-4.1.83.Final",
            "netty-4.1.82.Final",
            "netty-4.1.81.Final",
            "netty-4.1.80.Final",
            "netty-4.1.79.Final",
            "netty-4.1.78.Final",
            "netty-4.1.77.Final",
            "netty-4.1.76.Final",
            "netty-4.1.75.Final",
            "netty-4.1.74.Final",
            "netty-4.1.73.Final",
            "netty-4.1.72.Final",
            "netty-4.1.71.Final",
            "netty-4.1.70.Final",
            "netty-4.1.69.Final",
            "netty-4.1.68.Final",
            "netty-4.1.67.Final",
            "netty-4.1.66.Final",
            "netty-4.1.65.Final",
            "netty-4.1.64.Final",
            "netty-4.1.63.Final",
            "netty-4.1.62.Final",
            "netty-4.1.61.Final",
            "netty-4.1.60.Final",
            "netty-4.1.59.Final",
            "netty-4.1.58.Final",
            "netty-4.1.57.Final",
            "netty-4.1.56.Final",
            "netty-4.1.55.Final",
            "netty-4.1.54.Final",
            "netty-4.1.53.Final",
            "netty-4.1.52.Final",
            "netty-4.1.51.Final",
            "netty-4.1.50.Final",
            "netty-4.1.49.Final",
            "netty-4.1.48.Final",
            "netty-4.1.47.Final",
            "netty-4.1.46.Final",
            "netty-4.1.45.Final",
            "netty-4.1.44.Final",
            "netty-4.1.43.Final",
            "netty-4.1.42.Final",
            "netty-4.1.41.Final",
            "netty-4.1.40.Final",
            "netty-4.1.39.Final",
            "netty-4.1.38.Final",
            "netty-4.1.37.Final",
            "netty-4.1.36.Final",
            "netty-4.1.35.Final",
            "netty-4.1.34.Final",
            "netty-4.1.33.Final",
            "netty-4.1.32.Final",
            "netty-4.1.31.Final",
            "netty-4.1.30.Final",
            "netty-4.1.29.Final",
            "netty-4.1.28.Final",
            "netty-4.1.27.Final",
            "netty-4.1.26.Final",
            "netty-4.1.25.Final",
            "netty-4.1.24.Final",
            "netty-4.1.23.Final",
            "netty-4.1.22.Final",
            "netty-4.1.21.Final",
            "netty-4.1.20.Final",
            "netty-4.1.19.Final",
            "netty-4.1.18.Final",
            "netty-4.1.17.Final",
            "netty-4.1.16.Final",
            "netty-4.1.15.Final",
            "netty-4.1.14.Final",
            "netty-4.1.13.Final",
            "netty-4.1.12.Final",
            "netty-4.1.11.Final",
            "netty-4.1.10.Final",
            "netty-4.1.9.Final",
            "netty-4.1.8.Final",
            "netty-4.1.7.Final",
            "netty-4.1.6.Final",
            "netty-4.1.5.Final",
            "netty-4.1.4.Final",
            "netty-4.1.3.Final",
            "netty-4.1.2.Final",
            "netty-4.1.1.Final",
            "netty-4.1.0.Final",
            "netty-4.1.0.CR7",
            "netty-4.1.0.CR6",
            "netty-4.1.0.CR5",
            "netty-4.1.0.CR4",
            "netty-4.1.0.CR3",
            "netty-4.1.0.CR2",
            "netty-4.1.0.CR1",
            "netty-4.1.0.Beta8",
            "netty-4.1.0.Beta7",
            "netty-4.1.0.Beta6",
            "netty-4.1.0.Beta5",
            "netty-4.1.0.Beta4",
            "netty-4.1.0.Beta3",
            "netty-4.1.0.Beta2",
            "netty-4.1.0.Beta1",
            "netty-4.0.15.Final",
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            "netty-4.0.13.Final",
            "netty-4.0.12.Final",
            "netty-4.0.11.Final",
            "netty-4.0.10.Final",
            "netty-4.0.8.Final",
            "netty-4.0.7.Final",
            "netty-4.0.6.Final",
            "netty-4.0.5.Final",
            "netty-4.0.4.Final",
            "netty-4.0.3.Final",
            "netty-4.0.2.Final",
            "netty-4.0.1.Final",
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            "netty-4.0.0.CR9",
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            "netty-4.0.0.Beta3",
            "netty-4.0.0.Beta2",
            "netty-4.0.0.Beta1",
            "netty-4.0.0.Alpha8",
            "netty-4.0.0.Alpha7",
            "netty-4.0.0.Alpha6",
            "netty-4.0.0.Alpha5",
            "netty-4.0.0.Alpha4",
            "netty-4.0.0.Alpha3",
            "netty-4.0.0.Alpha2",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-42585.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.189809330Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42585.json",
        "https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-42585"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-444"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42585.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-42585",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498944,
  "published_at": "2026-05-13T18:12:39.586+00:00"
}