CVE catalog

CVE-2026-33870

Netty is an asynchronous, event-driven network…

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.132.Final and 4.2.10.Final, Netty incorrectly parses quoted strings in HTTP/1.1 chunked transfer encoding extension values, enabling request smuggling attacks. Versions 4.1.132.Final and 4.2.10.Final fix the issue.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Published: Mar 24, 2026, 11:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.70% · Oct 27, 2026

Projects and upstream resources

[netty][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "sid",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "forky",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "trixie",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "1:4.1.48-7+deb12u2"
    },
    {
      "name": "netty",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "1:4.1.48-7+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1132229,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1132229,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1132229,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": 1132229,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "netty",
      "ecosystem": "cpe",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "netty",
      "ecosystem": "cpe",
      "fixed_version": "4.1.132"
    },
    {
      "name": "netty",
      "ecosystem": "cpe",
      "fixed_version": "4.2.10"
    },
    {
      "name": "netty",
      "ranges": [
        {
          "fixed": "4.2.10",
          "introduced": "4.2.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "4.2.10",
      "provider_record_id": "NVD-CVE-2026-33870"
    },
    {
      "name": "netty-tcnative",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.75-150200.3.36.1"
            }
          ]
        }
      ],
      "release": "linux enterprise module for development tools 15 sp7",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "2.0.75-150200.3.36.1",
      "provider_record_id": "SUSE-SU-2026:1353-1"
    },
    {
      "name": "netty",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.132-150200.4.43.1"
            }
          ]
        }
      ],
      "release": "linux enterprise module for package hub 15 sp7",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.132-150200.4.43.1",
      "provider_record_id": "SUSE-SU-2026:1353-1"
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.132-150200.4.43.1"
            }
          ]
        }
      ],
      "release": "leap 15.6",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.132-150200.4.43.1",
      "provider_record_id": "SUSE-SU-2026:1353-1"
    },
    {
      "name": "netty-tcnative",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.75-150200.3.36.1"
            }
          ]
        }
      ],
      "release": "leap 15.6",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "2.0.75-150200.3.36.1",
      "provider_record_id": "SUSE-SU-2026:1353-1"
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.132-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.132-1.1",
      "provider_record_id": "OPENSUSE-SU-2026:10463-1"
    }
  ]
}

[Debian bug #1132229]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libnetty-java]Unknown
Source package: [netty]
Details (4)
- 1:4.1.48-7+deb12u2 · all · bookworm
  Affected
  nvd · netty · debian · bookworm; nvd · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm
  Affected
  nvd · netty · debian · bookworm; nvd · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Affected
  nvd · netty · debian · bookworm; nvd · netty · debian · 12
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Affected
  nvd · netty · debian · bookworm; nvd · netty · debian · 12

[Debian 13 (Trixie)]

[libnetty-java]Unknown
Source package: [netty]
Details (4)
- 1:4.1.48-10+deb13u1 · all · trixie
  Affected
  nvd · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie
  Affected
  nvd · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie-security
  Affected
  nvd · netty · debian · 13
- 1:4.1.48-10+deb13u1 · all · trixie-security
  Affected
  nvd · netty · debian · 13

[openSUSE Tumbleweed]

[netty]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 4.1.132-1.1
  nvd · netty · opensuse · tumbleweed
[netty-bom]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.132-1.1
  Version impact unknown
  nvd · netty · opensuse · tumbleweed
[netty-javadoc]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.132-1.1
  Version impact unknown
  nvd · netty · opensuse · tumbleweed
[netty-parent]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.132-1.1
  Version impact unknown
  nvd · netty · opensuse · tumbleweed

Observed: Oct 27, 2026, 8:03:05 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]