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CVE-2026-42585

📛 CVE Title

Netty: HTTP Request Smuggling due to malformed Transfer-Encoding

⬇ Download JSON ⚠ View as Threat

Description

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.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
MEDIUM
CVSS score
CVSS 6.5 / 10 6.5 6.5 / 10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Effective score
6.5 / 10 MEDIUM source: CNA overview
CWE(s)
CWE-444
Reserved
2026-04-28
Published
2026-05-13 20:12 UTC
Last updated
2026-05-15 22:34 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/42xxx/CVE-2026-42585.json
Linked Threat
CVE-2026-42585 — CVE-2026-42585

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-05-13 19:17:24 UTC
NVD last modified
2026-05-18 12:24:23 UTC
NVD CVSS v3.1
CVSS 6.5 / 10 6.5 6.5 / 10 MEDIUM source: security-advisories@github.com
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Exploitability subscore
3.9 / 10
Impact subscore
2.5 / 10
EPSS score
0.0001 (probability of exploitation in next 30 days)
EPSS percentile
1.69% vs all CVEs — higher = more likely to be exploited, as of 2026-05-24

NVD / KEV / EPSS data refreshed 2026-05-25 09:21 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-30128
Assigner
GitHub_M
Published
May 13, 2026, 6:12:39 PM
Updated
May 15, 2026, 8:34:21 PM
EUVD base score (CVSS 3.1)
6.5 / 10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
EUVD-reported EPSS
0.0100
Vendors
io.netty, netty
Products
netty (4.2.0.Alpha1, < 4.2.13.Final)
netty-codec-http (4.2.0.Alpha1, < 4.2.13.Final)
netty-codec-http (< 4.1.133.Final)
netty (< 4.1.133.Final)
Aliases
GHSA-38f8-5428-x5cv

ENISA description: 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.

EUVD references (1)

Affected products (2)
VendorProductVersionsPlatforms
netty netty >= 4.2.0.Alpha1, < 4.2.13.Final (affected), < 4.1.133.Final (affected) —
io.netty netty-codec-http >= 4.2.0.Alpha1, < 4.2.13.Final (affected), < 4.1.133.Final (affected) —

Affected products — CPE 2.3 (1) NVD

NVD's normalized CPE 2.3 matchers, used by vendor tools (vulnerability scanners, asset managers) for automated detection. Compare with the CNA's free-text "Affected products" section above.

  • cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

Vendor references (1)

References embedded in the original CVE record by the assigning CNA.

MITRE references (1) cveawg.mitre.org

Pulled from MITRE's CVE Services API by the 🛰 Backfill from MITRE button.

Web references (3)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

NVD-tagged references (2)

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

Remediations (15)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-42585.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42585",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-15T20:33:59.288432Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-15T20:34:21.305Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "netty",
          "vendor": "netty",
          "versions": [
            {
              "status": "affected",
              "version": ">= 4.2.0.Alpha1, < 4.2.13.Final"
            },
            {
              "status": "affected",
              "version": "< 4.1.133.Final"
            }
          ]
        },
        {
          "product": "netty-codec-http",
          "vendor": "io.netty",
          "versions": [
            {
              "status": "affected",
              "version": ">= 4.2.0.Alpha1, < 4.2.13.Final"
            },
            {
              "status": "affected",
              "version": "< 4.1.133.Final"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "metrics": [
        {
          "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"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T18:13:17.497Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/netty/netty/security/advisories/GHSA-38f8-5428-x5cv"
        }
      ],
      "source": {
        "advisory": "GHSA-38f8-5428-x5cv",
        "discovery": "UNKNOWN"
      },
      "title": "Netty: HTTP Request Smuggling due to malformed Transfer-Encoding"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42585",
    "datePublished": "2026-05-13T18:12:39.586Z",
    "dateReserved": "2026-04-28T17:26:12.086Z",
    "dateUpdated": "2026-05-15T20:34:21.305Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}