CVE catalog

CVE-2025-67735

Netty vulnerabilities

Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.129.Final and 4.2.8.Final, the `io.netty.handler.codec.http.HttpRequestEncoder` has a CRLF injection with the request URI when constructing a request. This leads to request smuggling when `HttpRequestEncoder` is used without proper sanitization of the URI. Any application / framework using `HttpRequestEncoder` can be subject to be abused to perform request smuggling using CRLF injection. Versions 4.1.129.Final and 4.2.8.Final fix the issue.

Severity: Medium · CVSS 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Published: Dec 16, 2025, 12:19:11 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.32% · 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": "fixed",
      "release": "sid",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "forky",
      "version": "1:4.1.48-16"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "trixie-security",
      "version": "1:4.1.48-10+deb13u1"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm",
      "version": "1:4.1.48-7+deb12u2"
    },
    {
      "name": "netty",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "1:4.1.48-7+deb12u2"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1123606,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-16"
    },
    {
      "bug": 1123606,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-16"
    },
    {
      "bug": 1123606,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-10+deb13u1"
    },
    {
      "bug": 1123606,
      "name": "netty",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "1:4.1.48-7+deb12u2"
    }
  ],
  "distribution_packages": [
    {
      "name": "netty",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "not yet fixed"
    },
    {
      "name": "netty",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "1:4.1.48-9ubuntu0.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "1:4.1.48-9ubuntu0.2"
    },
    {
      "name": "libnetty-java",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "1:4.1.48-9ubuntu0.2",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "1:4.1.48-9ubuntu0.2"
    },
    {
      "name": "netty",
      "ranges": [
        {
          "fixed": "4.2.8",
          "introduced": "4.2.0",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "4.2.8",
      "provider_record_id": "NVD-CVE-2025-67735"
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.130-1.1"
            }
          ]
        }
      ],
      "release": "tumbleweed",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.130-1.1",
      "provider_record_id": "OPENSUSE-SU-2025:15824-1"
    },
    {
      "name": "netty",
      "distro": "suse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.130-150200.4.40.1"
            }
          ]
        }
      ],
      "release": "linux enterprise module for package hub 15 sp7",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.130-150200.4.40.1",
      "provider_record_id": "SUSE-SU-2025:4489-1"
    },
    {
      "name": "netty",
      "distro": "opensuse",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.130-150200.4.40.1"
            }
          ]
        }
      ],
      "release": "leap 15.6",
      "versions": [],
      "ecosystem": "rpm",
      "fixed_version": "4.1.130-150200.4.40.1",
      "provider_record_id": "SUSE-SU-2025:4489-1"
    }
  ]
}

[Debian bug #1123606]

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
  Fixed · Fixed: 1:4.1.48-7+deb12u2
  usn · netty · debian · bookworm
- 1:4.1.48-7+deb12u2 · all · bookworm
  Fixed · Fixed: 1:4.1.48-7+deb12u2
  usn · netty · debian · bookworm
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:4.1.48-7+deb12u2
  usn · netty · debian · bookworm
- 1:4.1.48-7+deb12u2 · all · bookworm-security
  Fixed · Fixed: 1:4.1.48-7+deb12u2
  usn · netty · debian · bookworm

[openSUSE Tumbleweed]

[netty]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · x86_64 · tumbleweed
  Fixed · Fixed: 4.1.130-1.1
  usn · netty · opensuse · tumbleweed
[netty-bom]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.130-1.1
  Version impact unknown
  usn · netty · opensuse · tumbleweed
[netty-javadoc]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.130-1.1
  Version impact unknown
  usn · netty · opensuse · tumbleweed
[netty-parent]Unknown
Source package: [netty]
Details (1)
- 4.1.136-1.1 · noarch · tumbleweed
  Unknown · Fixed: 4.1.130-1.1
  Version impact unknown
  usn · netty · opensuse · tumbleweed

Observed: Oct 27, 2026, 10:25:22 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] · [Ubuntu Security Notices (USN)]