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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.

PUBLISHED Reserved 2025-06-25 | Published 2026-06-18 | Updated 2026-06-18 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-400: Uncontrolled Resource Consumption

Product status

>= 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
affected

References

github.com/...cometd/security/advisories/GHSA-cqgj-h8vf-4w59

github.com/cometd/cometd/issues/2117

github.com/cometd/cometd/pull/2118

github.com/cometd/cometd/pull/2168

github.com/cometd/cometd/pull/2169

github.com/cometd/cometd/discussions/2116

cve.org (CVE-2025-53114)

nvd.nist.gov (CVE-2025-53114)

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