{
"id": "GHSA-cqgj-h8vf-4w59",
"aliases": [
"CVE-2025-53114"
],
"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",
"summary": "Acknowledgement extension out of memory",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "5.0.0"
},
{
"fixed": "5.0.23"
}
]
}
],
"package": {
"name": "org.cometd.java:cometd-java-server-common",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 5.0.22"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.0.0"
},
{
"fixed": "6.0.19"
}
]
}
],
"package": {
"name": "org.cometd.java:cometd-java-server-common",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 6.0.18"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "7.0.0"
},
{
"fixed": "7.0.19"
}
]
}
],
"package": {
"name": "org.cometd.java:cometd-java-server-common",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 7.0.18"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "8.0.0"
},
{
"fixed": "8.0.9"
}
]
}
],
"package": {
"name": "org.cometd.java:cometd-java-server-common",
"ecosystem": "Maven"
},
"database_specific": {
"last_known_affected_version_range": "<= 8.0.8"
}
}
],
"modified": "2026-06-10T16:46:28Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"published": "2026-06-10T16:46:28Z",
"references": [
{
"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": "WEB"
},
{
"url": "https://github.com/cometd/cometd",
"type": "PACKAGE"
},
{
"url": "https://github.com/cometd/cometd/discussions/2116",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-06-10T16:46:28Z"
}
}