Vulnerability-Lookup

GHSA-CQGJ-H8VF-4W59

Vulnerability from github – Published: 2026-06-10 16:46 – Updated: 2026-06-10 16:46

Summary

Acknowledgement extension out of memory

Details

Impact

Bad clients that always send a fixed batch value while the server is using the acknowledgement extension can cause the unacknowledged message queue to grow indefinitely, eventually resulting in an OutOfMemoryError.

Such bad clients would always send:

{
  "channel": "/meta/connect",
  ...
  "ext": { "ack": 1 }
}

The server would never clear the unacknowledged message queue, and one bad client can cause a server outage.

Patches

5.0.x - https://github.com/cometd/cometd/pull/2168 6.0.x - https://github.com/cometd/cometd/pull/2169 8.0.x - https://github.com/cometd/cometd/pull/2118

Workarounds

Disable the acknowledgement extension.

Resources

https://github.com/cometd/cometd/discussions/2116 https://github.com/cometd/cometd/issues/2117

Severity

7.5 (High)


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

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JSON

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 5.0.22"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.cometd.java:cometd-java-server-common"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.0.0"
            },
            {
              "fixed": "5.0.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 6.0.18"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.cometd.java:cometd-java-server-common"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.0.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 7.0.18"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.cometd.java:cometd-java-server-common"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "7.0.0"
            },
            {
              "fixed": "7.0.19"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 8.0.8"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "org.cometd.java:cometd-java-server-common"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.0.0"
            },
            {
              "fixed": "8.0.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-53114"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-06-10T16:46:28Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nBad clients that always send a fixed batch value while the server is using the acknowledgement extension can cause the unacknowledged message queue to grow indefinitely, eventually resulting in an OutOfMemoryError.\n\nSuch bad clients would always send:\n\n```json\n{\n  \"channel\": \"/meta/connect\",\n  ...\n  \"ext\": { \"ack\": 1 }\n}\n```\n\nThe server would never clear the unacknowledged message queue, and one bad client can cause a server outage.\n\n### Patches\n5.0.x - https://github.com/cometd/cometd/pull/2168\n6.0.x - https://github.com/cometd/cometd/pull/2169\n8.0.x - https://github.com/cometd/cometd/pull/2118\n\n### Workarounds\nDisable the acknowledgement extension.\n\n### Resources\nhttps://github.com/cometd/cometd/discussions/2116\nhttps://github.com/cometd/cometd/issues/2117",
  "id": "GHSA-cqgj-h8vf-4w59",
  "modified": "2026-06-10T16:46:28Z",
  "published": "2026-06-10T16:46:28Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/issues/2117"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/pull/2118"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/pull/2168"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/pull/2169"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/cometd/cometd"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cometd/cometd/discussions/2116"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Acknowledgement extension out of memory"
}

CVE-2025-53114 (GCVE-0-2025-53114)

Vulnerability from cvelistv5 – Published: 2026-06-18 16:25 – Updated: 2026-06-18 17:33

Title

CometD has acknowledgement extension out of memory

Summary

CometD is a scalable comet implementation for web messaging. In versions 5.0.0 through 5.0.22, 6.0.0 through 6.0.18, 7.0.0 through 7.0.18, and 8.0.0 through 8.0.8, bad clients that always send a fixed batch value when the server is using the acknowledgement extension may cause the unacknowledged message queue to grow indefinitely, eventually causing an `OutOfMemoryError`. Versions 5.0.23, 6.0.19, 7.0.19, and 8.0.9 patch the issue. As a workaround, disable the acknowledgement extension.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-18 17:30 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M mitre root Scorecard

References

6 references

URL	Tags
https://github.com/cometd/cometd/security/advisor…	x_refsource_CONFIRM
https://github.com/cometd/cometd/issues/2117	x_refsource_MISC
https://github.com/cometd/cometd/pull/2118	x_refsource_MISC
https://github.com/cometd/cometd/pull/2168	x_refsource_MISC
https://github.com/cometd/cometd/pull/2169	x_refsource_MISC
https://github.com/cometd/cometd/discussions/2116	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
cometd	cometd	Affected: >= 5.0.0, < 5.0.23 Affected: >= 6.0.0, < 6.0.19 Affected: >= 7.0.0, < 7.0.19 Affected: >= 8.0.0, < 8.0.9

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-53114",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-18T17:30:58.888648Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-18T17:33:39.552Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "cometd",
          "vendor": "cometd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 5.0.0, \u003c 5.0.23"
            },
            {
              "status": "affected",
              "version": "\u003e= 6.0.0, \u003c 6.0.19"
            },
            {
              "status": "affected",
              "version": "\u003e= 7.0.0, \u003c 7.0.19"
            },
            {
              "status": "affected",
              "version": "\u003e= 8.0.0, \u003c 8.0.9"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CometD is a scalable comet implementation for web messaging. In versions 5.0.0 through 5.0.22, 6.0.0 through 6.0.18, 7.0.0 through 7.0.18, and 8.0.0 through 8.0.8, bad clients that always send a fixed batch value when the server is using the acknowledgement extension may cause the unacknowledged message queue to grow indefinitely, eventually causing an `OutOfMemoryError`. Versions 5.0.23, 6.0.19, 7.0.19, and 8.0.9 patch the issue. As a workaround, disable the acknowledgement extension."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-400",
              "description": "CWE-400: Uncontrolled Resource Consumption",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-18T16:25:47.388Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59"
        },
        {
          "name": "https://github.com/cometd/cometd/issues/2117",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cometd/cometd/issues/2117"
        },
        {
          "name": "https://github.com/cometd/cometd/pull/2118",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cometd/cometd/pull/2118"
        },
        {
          "name": "https://github.com/cometd/cometd/pull/2168",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cometd/cometd/pull/2168"
        },
        {
          "name": "https://github.com/cometd/cometd/pull/2169",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cometd/cometd/pull/2169"
        },
        {
          "name": "https://github.com/cometd/cometd/discussions/2116",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/cometd/cometd/discussions/2116"
        }
      ],
      "source": {
        "advisory": "GHSA-cqgj-h8vf-4w59",
        "discovery": "UNKNOWN"
      },
      "title": "CometD has acknowledgement extension out of memory"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2025-53114",
    "datePublished": "2026-06-18T16:25:47.388Z",
    "dateReserved": "2025-06-25T13:41:23.088Z",
    "dateUpdated": "2026-06-18T17:33:39.552Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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