CometD has acknowledgement extension out of memory

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Summary

CVECVE-2025-53114
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-18 17:16:27 UTC
Updated2026-06-18 18:16:18 UTC
DescriptionCometD 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

Problem Types: CWE-400 | CWE-400 CWE-400: Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cometd Cometd affected >= 5.0.0, < 5.0.23 Not specified
CNA Cometd Cometd affected >= 6.0.0, < 6.0.19 Not specified
CNA Cometd Cometd affected >= 7.0.0, < 7.0.19 Not specified
CNA Cometd Cometd affected >= 8.0.0, < 8.0.9 Not specified

References

ReferenceSourceLinkTags
github.com/cometd/cometd/pull/2168 [email protected] github.com
github.com/cometd/cometd/discussions/2116 [email protected] github.com
github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59 [email protected] github.com
github.com/cometd/cometd/pull/2118 [email protected] github.com
github.com/cometd/cometd/pull/2169 [email protected] github.com
github.com/cometd/cometd/issues/2117 [email protected] github.com
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