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

Vulnerability from cvelistv5 – Published: 2026-09-10 17:39 – Updated: 2026-09-18 17:23
VLAI
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
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
6.9 (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
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 17:11 UTC
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Assigner
References
Impacted products
Vendor Product Version CPE status
netty netty Affected: 4.1.133.Final , < 4.1.138.Final (custom)
Affected: 4.2.13.Final , < 4.2.18.Final (custom)
guessed Create a notification for this product.
Date Public
2026-07-20 00:00
Credits
Yu Bao, PayPal Cyber Security Team dreamlike-ocean Michael-JRead
Show details on NVD website
To clipboard 

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                  "lang": "en",
                  "type": "CWE"
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          ],
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            "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
            "shortName": "VulnCheck"
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          "references": [
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              "name": "GitHub Security Advisory (GHSA-hcvj-94mj-jp5c)",
              "tags": [
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              ],
              "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",
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              "url": "https://github.com/netty/netty/commit/ca87393b0e9e13c493d213a268e727a6d44e1585"
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              "name": "Suffix-based chunked-must-be-last check at netty-4.1.137.Final",
              "tags": [
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              "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": [
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              "url": "https://github.com/netty/netty/releases/tag/netty-4.1.138.Final"
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            {
              "name": "netty netty-4.2.18.Final Release Notes",
              "tags": [
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              "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"
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              "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"
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          ],
          "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"
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        }
      },
      "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": "2026-09-18T17:23:07.234Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.