CometD has acknowledgement extension out of memory_CVE-2025-53114

7.5 / 10

HIGH

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

Description

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.

Basic Information

ID CVE-2025-53114

Source GitHub_M

Published Jun 18, 2026 at 16:25

Modified Jun 18, 2026 at 17:33

Affected Product

Vendor cometd

Product cometd

Version >= 5.0.0, < 5.0.23

Affected Versions cometd cometd >= 5.0.0, < 5.0.23
cometd cometd >= 6.0.0, < 6.0.19
cometd cometd >= 7.0.0, < 7.0.19
cometd cometd >= 8.0.0, < 8.0.9

CWE Classification

CWE-400

References

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    "published": "2026-06-18T16:25:47.388Z",
    "modified": "2026-06-18T17:33:39.552Z",
    "type": "cve",
    "title": "CometD has acknowledgement extension out of memory",
    "source": "GitHub_M",
    "references": "https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59\nhttps://github.com/cometd/cometd/issues/2117\nhttps://github.com/cometd/cometd/pull/2118\nhttps://github.com/cometd/cometd/pull/2168\nhttps://github.com/cometd/cometd/pull/2169\nhttps://github.com/cometd/cometd/discussions/2116",
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