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Vulnerability record · CVE-2025-53114 · published 18 June 2026

CVE-2025-53114: Uncontrolled resource consumption vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.68% · top 49.4% CWE-400 · Uncontrolled resource consumption Deferred
7.5CVSS 3.1 base score
0.68%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
6References
23 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://github.com/cometd/cometd/discussions/2116
https://github.com/cometd/cometd/issues/2117
https://github.com/cometd/cometd/pull/2118
https://github.com/cometd/cometd/pull/2168
https://github.com/cometd/cometd/pull/2169
https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59

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Source: NIST National Vulnerability Database (record CVE-2025-53114), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.