CometD has acknowledgement extension out of memory
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| cometd | cometd | 5.0.0 to before 5.0.23; 6.0.0 to before 6.0.19; 7.0.0 to before 7.0.19; 8.0.0 to before 8.0.9 | 5.0.23, 6.0.19, 7.0.19, 8.0.9 | Patch available | CNA |
| — | org.cometd.java:cometd-java-server-common (Maven) | 5.0.0 to before 5.0.23 | 5.0.23 | Patch available | GHSA-cqgj-h8vf-4w59 |
| — | org.cometd.java:cometd-java-server-common (Maven) | 6.0.0 to before 6.0.19 | 6.0.19 | Patch available | GHSA-cqgj-h8vf-4w59 |
| — | org.cometd.java:cometd-java-server-common (Maven) | 7.0.0 to before 7.0.19 | 7.0.19 | Patch available | GHSA-cqgj-h8vf-4w59 |
| — | org.cometd.java:cometd-java-server-common (Maven) | 8.0.0 to before 8.0.9 | 8.0.9 | Patch available | GHSA-cqgj-h8vf-4w59 |
- cometd Vendorcometd Affected 5.0.0 to before 5.0.23; 6.0.0 to before 6.0.19; 7.0.0 to before 7.0.19; 8.0.0 to before 8.0.9 Fixed in 5.0.23, 6.0.19, 7.0.19, 8.0.9 Patch available CNA
- org.cometd.java:cometd-java-server-common (Maven) Vendor— Affected 5.0.0 to before 5.0.23 Fixed in 5.0.23 Patch available GHSA-cqgj-h8vf-4w59
- org.cometd.java:cometd-java-server-common (Maven) Vendor— Affected 6.0.0 to before 6.0.19 Fixed in 6.0.19 Patch available GHSA-cqgj-h8vf-4w59
- org.cometd.java:cometd-java-server-common (Maven) Vendor— Affected 7.0.0 to before 7.0.19 Fixed in 7.0.19 Patch available GHSA-cqgj-h8vf-4w59
- org.cometd.java:cometd-java-server-common (Maven) Vendor— Affected 8.0.0 to before 8.0.9 Fixed in 8.0.9 Patch available GHSA-cqgj-h8vf-4w59
Remediation
- Fix · CNA cometd (cometd) Fixed in 5.0.23, 6.0.19, 7.0.19, 8.0.9
- Fix · GHSA-cqgj-h8vf-4w59 org.cometd.java:cometd-java-server-common (Maven) Fixed in 5.0.23 Advisory →
- Fix · GHSA-cqgj-h8vf-4w59 org.cometd.java:cometd-java-server-common (Maven) Fixed in 6.0.19 Advisory →
- Fix · GHSA-cqgj-h8vf-4w59 org.cometd.java:cometd-java-server-common (Maven) Fixed in 7.0.19 Advisory →
- Fix · GHSA-cqgj-h8vf-4w59 org.cometd.java:cometd-java-server-common (Maven) Fixed in 8.0.9 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-53114
- 2026-10-03 Alias added: GHSA-cqgj-h8vf-4w59
References
Other 7
- https://github.com/cometd/cometd/security/advisories/GHSA-cqgj-h8vf-4w59
- 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/discussions/2116
- https://github.com/cometd/cometd
More cometd vulnerabilities
- TI-2022-08536 Incorrect Authorization in org.cometd.oort CVSS 3.1HIGH 8.1
Sources
- CVE-2025-53114 · CVE Program
- CVE-2025-53114 · NVD
- FIRST EPSS
- GHSA-cqgj-h8vf-4w59 · GitHub Advisory Database · CC BY 4.0
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