Vulnerability-Lookup

GHSA-W753-5FFQ-99WR

Vulnerability from github – Published: 2026-09-07 12:30 – Updated: 2026-09-07 12:30

Details

A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap.

This occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.

Severity

8.7 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-19204"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-07T11:17:20Z",
    "severity": "HIGH"
  },
  "details": "A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap.\n\n\n\n\nThis occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.",
  "id": "GHSA-w753-5ffq-99wr",
  "modified": "2026-09-07T12:30:29Z",
  "published": "2026-09-07T12:30:29Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-19204"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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-2026-19204 (GCVE-0-2026-19204)

Vulnerability from cvelistv5 – Published: 2026-09-07 10:19 – Updated: 2026-09-08 15:06

Summary

A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap. This occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated.

Severity

8.7 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-08 15:06 UTC

CWE

CWE-770 - Allocation of resources without limits or throttling
CWE-789 - Memory allocation with excessive size value

Assigner

eclipse mitre root

References

1 reference

URL	Tags
https://github.com/jetty/jetty.project/security/a…

Impacted products

1 product

Vendor	Product	Version
Eclipse Foundation	Eclipse Jetty	Affected: 12.1.0 , ≤ 12.1.11 (semver) Affected: 12.0.0 , ≤ 12.0.37 (semver) Affected: 11.0.0 , ≤ 11.0.31 (semver) Affected: 10.0.0 , ≤ 10.0.31 (semver)

Credits

Arthur Chan David Korczynski Adam Korcz

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-19204",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-08T15:06:34.664874Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-08T15:06:46.810Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
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    ],
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              "versionType": "semver"
            },
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              "lessThanOrEqual": "12.0.37",
              "status": "affected",
              "version": "12.0.0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "11.0.31",
              "status": "affected",
              "version": "11.0.0",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "10.0.31",
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          "type": "reporter",
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        },
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          "lang": "en",
          "type": "reporter",
          "value": "David Korczynski"
        },
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          "type": "reporter",
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        }
      ],
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            }
          ],
          "value": "A client may send a WebSocket frame with an unknown opcode and a very large declared payload length, causing Jetty to attempt a large memory allocation and potentially exhaust the JVM heap.\n\n\n\n\nThis occurs when auto-fragmentation is enabled, as unknown opcodes bypass the normal maximum frame size handling and payload allocation occurs before the opcode is validated."
        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
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            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
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            "subConfidentialityImpact": "NONE",
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            "vulnerabilityResponseEffort": "NOT_DEFINED"
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          "descriptions": [
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              "description": "CWE-789 Memory allocation with excessive size value",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-09-07T10:19:24.186Z",
        "orgId": "e51fbebd-6053-4e49-959f-1b94eeb69a2c",
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      "references": [
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          "url": "https://github.com/jetty/jetty.project/security/advisories/GHSA-85fq-fc5f-7j7g"
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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-W753-5FFQ-99WR

CVE-2026-19204 (GCVE-0-2026-19204)

Tags

Sightings

Nomenclature