Apache Tomcat: WebSocket DoS due to lost asynchronous write timeout

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-79677
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-23 12:17:07 UTC
Updated2026-09-23 19:19:28 UTC
DescriptionMissing release of resource after effective lifetime, Comparison using wrong factors vulnerability in Apache Tomcat allows a denial of service as a result of lost time outs for asynchronous WebSocket writes. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.43 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.003220000 probability, percentile 0.225560000 (date 2026-09-24)

Problem Types: CWE-772 | CWE-1025 | CWE-772 CWE-772 Missing release of resource after effective lifetime | CWE-1025 CWE-1025 Comparison using wrong factors

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS: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 Apache Software Foundation Apache Tomcat affected 11.0.0-M1 11.0.25 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 10.1.0-M1 10.1.59 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 9.0.0.M1 9.0.121 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 8.5.0 8.5.100 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 7.0.43 7.0.109 semver Not specified
CNA Apache Software Foundation Apache Tomcat unaffected 7.0.43 semver Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/09/23/27 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
lists.apache.org/thread/bzwps6ck4szf2hmksbbon3syyl9qnkv8 [email protected] lists.apache.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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