CVE-2026-78383: CWE-770 Allocation of resources without limits or throttling in Apache Software Foundation Apache Tomcat
CVE-2026-78383 is a resource allocation vulnerability in Apache Tomcat affecting multiple versions from 7.0.0 through 11.0.25. It allows an unauthenticated AJP request to pin an AJP processing thread, resulting in denial of service. The issue is addressed in Apache Tomcat versions 11.0.26, 10.1.60, and 9.0.122.
AI Analysis
Technical Summary
This vulnerability (CWE-770) in Apache Tomcat involves allocation of resources without limits or throttling in the AJP connector. An unauthenticated attacker can send a crafted AJP request that pins an AJP processing thread, causing denial of service by exhausting available threads. Affected versions include 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, and older EOL versions 8.5.0 through 8.5.100 and 7.0.0 through 7.0.109. The issue is fixed in versions 11.0.26, 10.1.60, and 9.0.122.
Potential Impact
An unauthenticated attacker can cause denial of service by exhausting AJP processing threads, potentially disrupting service availability for legitimate users.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 11.0.26, 10.1.60, or 9.0.122 where the vulnerability is fixed. No other mitigation or temporary workaround is indicated.
CVE-2026-78383: CWE-770 Allocation of resources without limits or throttling in Apache Software Foundation Apache Tomcat
Description
CVE-2026-78383 is a resource allocation vulnerability in Apache Tomcat affecting multiple versions from 7.0.0 through 11.0.25. It allows an unauthenticated AJP request to pin an AJP processing thread, resulting in denial of service. The issue is addressed in Apache Tomcat versions 11.0.26, 10.1.60, and 9.0.122.
Affected software
Apache Software Foundation
Apache Tomcat
pkg:maven/org.apache.tomcat/tomcatRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CWE-770) in Apache Tomcat involves allocation of resources without limits or throttling in the AJP connector. An unauthenticated attacker can send a crafted AJP request that pins an AJP processing thread, causing denial of service by exhausting available threads. Affected versions include 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, and older EOL versions 8.5.0 through 8.5.100 and 7.0.0 through 7.0.109. The issue is fixed in versions 11.0.26, 10.1.60, and 9.0.122.
Potential Impact
An unauthenticated attacker can cause denial of service by exhausting AJP processing threads, potentially disrupting service availability for legitimate users.
Mitigation Recommendations
Users should upgrade affected Apache Tomcat versions to 11.0.26, 10.1.60, or 9.0.122 where the vulnerability is fixed. No other mitigation or temporary workaround is indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-08-24T13:38:58.809Z
- State
- PUBLISHED
Threat ID: 6ab3b90df7a7c54106b30f14
Added to database: 09/23/2026, 11:33:33 UTC
Last enriched: 09/23/2026, 11:48:51 UTC
Last updated: 09/23/2026, 13:54:21 UTC
Views: 4
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