Vulnerability-Lookup

GHSA-77QF-R755-9GCW

Vulnerability from github – Published: 2026-09-10 18:31 – Updated: 2026-09-10 18:31

Details

Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like 'chunked, xchunked' to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

6.9 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89044"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-444"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-10T18:18:16Z",
    "severity": "MODERATE"
  },
  "details": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like \u0027chunked, xchunked\u0027 to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks.",
  "id": "GHSA-77qf-r755-9gcw",
  "modified": "2026-09-10T18:31:50Z",
  "published": "2026-09-10T18:31:50Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89044"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
    },
    {
      "type": "WEB",
      "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-89044 (GCVE-0-2026-89044)

Vulnerability from cvelistv5 – Published: 2026-09-10 17:39 – Updated: 2026-09-10 17:39

Title

Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding

Summary

Severity

6.9 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Assigner

VulnCheck mitre root

References

8 references

URL	Tags
https://github.com/netty/netty/security/advisorie…	vendor-advisory
https://github.com/netty/netty/commit/ca87393b0e9…	patch
https://github.com/netty/netty/commit/640d4d3324f…	patch
https://github.com/netty/netty/blob/netty-4.1.137…	technical-description
https://github.com/netty/netty/releases/tag/netty…	release-notes
https://github.com/netty/netty/releases/tag/netty…	release-notes
https://github.com/netty/netty	product
https://www.vulncheck.com/advisories/netty-4.1.13…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
netty	netty	Affected: 4.1.133.Final , < 4.1.138.Final (custom) Affected: 4.2.13.Final , < 4.2.18.Final (custom)

Date Public

2026-07-20 00:00

Credits

Yu Bao, PayPal Cyber Security Team dreamlike-ocean Michael-JRead

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo1.maven.org/maven2/io/netty/netty-codec-http/",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:maven/io.netty/netty-codec-http",
          "product": "netty",
          "repo": "https://github.com/netty/netty",
          "vendor": "netty",
          "versions": [
            {
              "lessThan": "4.1.138.Final",
              "status": "affected",
              "version": "4.1.133.Final",
              "versionType": "custom"
            },
            {
              "lessThan": "4.2.18.Final",
              "status": "affected",
              "version": "4.2.13.Final",
              "versionType": "custom"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.1.138.final",
                  "versionStartIncluding": "4.1.133.final",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        },
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.2.18.final",
                  "versionStartIncluding": "4.2.13.final",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Yu Bao, PayPal Cyber Security Team"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "dreamlike-ocean"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Michael-JRead"
        }
      ],
      "datePublic": "2026-07-20T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "Netty versions 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final fail to properly validate the final transfer coding in the Transfer-Encoding header, allowing attackers to smuggle requests by using malformed encoding declarations. Attackers can split Transfer-Encoding headers across multiple lines or use values like \u0027chunked, xchunked\u0027 to bypass validation and decode messages as chunked when the final coding is not chunked, enabling request smuggling attacks."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 6.9,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request/Response Smuggling\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-10T17:39:34.162Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GitHub Security Advisory (GHSA-hcvj-94mj-jp5c)",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/netty/netty/security/advisories/GHSA-hcvj-94mj-jp5c"
        },
        {
          "name": "Fix commit on the 4.1 branch: match the final transfer-coding token exactly",
          "tags": [
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          ],
          "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
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        {
          "name": "Fix commit on the 4.2 branch",
          "tags": [
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          ],
          "url": "https://github.com/netty/netty/commit/640d4d3324f7b811a4903d0730c8ccb35500500c"
        },
        {
          "name": "Suffix-based chunked-must-be-last check at netty-4.1.137.Final",
          "tags": [
            "technical-description"
          ],
          "url": "https://github.com/netty/netty/blob/netty-4.1.137.Final/codec-http/src/main/java/io/netty/handler/codec/http/HttpObjectDecoder.java#L866"
        },
        {
          "name": "netty netty-4.1.138.Final Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
        },
        {
          "name": "netty netty-4.2.18.Final Release Notes",
          "tags": [
            "release-notes"
          ],
          "url": "https://github.com/netty/netty/releases/tag/netty-4.2.18.Final"
        },
        {
          "name": "netty/netty",
          "tags": [
            "product"
          ],
          "url": "https://github.com/netty/netty"
        },
        {
          "name": "VulnCheck Advisory: Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/netty-4.1.133-final-through-4.1.137-final-and-4.2.13-final-through-4.2.17-final-http-request-smuggling-via-transfer-encoding"
        }
      ],
      "title": "Netty 4.1.133.Final through 4.1.137.Final and 4.2.13.Final through 4.2.17.Final HTTP Request Smuggling via Transfer-Encoding",
      "x_generator": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-89044",
    "datePublished": "2026-09-10T17:39:34.162Z",
    "dateReserved": "2026-09-10T16:45:13.890Z",
    "dateUpdated": "2026-09-10T17:39:34.162Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-77QF-R755-9GCW

CVE-2026-89044 (GCVE-0-2026-89044)

Tags

Sightings

Nomenclature