Summary
Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.
Security Fix(es):
* tomcat: Apache Tomcat DoS in multipart upload (CVE-2025-48988)
* tomcat: Apache Tomcat: Security constraint bypass for pre/post-resources (CVE-2025-49125)
* apache-commons-fileupload: Apache Commons FileUpload DoS via part headers (CVE-2025-48976)
* tomcat: http/2 "MadeYouReset" DoS attack through HTTP/2 control frames (CVE-2025-48989)
* tomcat: Apache Tomcat denial of service (CVE-2025-52520)
* tomcat: Apache Tomcat denial of service (CVE-2025-52434)
* tomcat: Apache Tomcat denial of service (CVE-2025-53506)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Fixed packages 8
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 10 | tomcat9 | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-admin-webapps | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-docs-webapp | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-el-3.0-api | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-jsp-2.3-api | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-lib | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-servlet-4.0-api | 1:9.0.87-5.el10_0.3 |
| AlmaLinux · 10 | tomcat9-webapps | 1:9.0.87-5.el10_0.3 |
Vulnerabilities 7
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High 7.5
Apache Commons FileUpload, Apache Commons FileUpload: FileUpload DoS via part headers
Allocation of resources for multipart headers with insufficient limits enabled a DoS vulnerability in Apache Commons FileUpload. This issue affects Apache Commons FileUpload: from 1.0 before 1.6; from 2.0.0-M1 before 2.0.0-M4. Users are recommended to upgrade…
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High 7.5
Apache Tomcat: FileUpload large number of parts with headers DoS
Allocation of Resources Without Limits or Throttling vulnerability in Apache Tomcat. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.7, from 10.1.0-M1 through 10.1.41, from 9.0.0.M1 through 9.0.105. The following versions were EOL at the time th…
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High 7.5
Apache Tomcat: h2 DoS - Made You Reset
Improper Resource Shutdown or Release vulnerability in Apache Tomcat made Tomcat vulnerable to the made you reset attack. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.9, from 10.1.0-M1 through 10.1.43 and from 9.0.0.M1 through 9.0.107. Older,…
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High 7.5CVE-2025-49125 Public exploit
Apache Tomcat: Security constraint bypass for pre/post-resources
Authentication Bypass Using an Alternate Path or Channel vulnerability in Apache Tomcat. When using PreResources or PostResources mounted other than at the root of the web application, it was possible to access those resources via an unexpected path. That pa…
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High 7.5
Apache Tomcat: APR/Native Connector crash leading to DoS
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector. This was particularly noticeable with client initiated closes of HTTP/2 connections. This issue aff…
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High 7.5
Apache Tomcat: DoS via integer overflow in multipart file upload
For some unlikely configurations of multipart upload, an Integer Overflow vulnerability in Apache Tomcat could lead to a DoS via bypassing of size limits. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, from 9.…
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High 7.5
Apache Tomcat: DoS via excessive h2 streams at connection start
Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10…
References
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report
https://access.redhat.com/security/cve/CVE-2025-48976
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report
https://access.redhat.com/security/cve/CVE-2025-48988
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report
https://access.redhat.com/security/cve/CVE-2025-48989
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report
https://access.redhat.com/security/cve/CVE-2025-49125
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report
https://access.redhat.com/security/cve/CVE-2025-52434
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report
https://access.redhat.com/security/cve/CVE-2025-52520
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report
https://access.redhat.com/security/cve/CVE-2025-53506
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report
https://bugzilla.redhat.com/2373015
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report
https://bugzilla.redhat.com/2373018
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report
https://bugzilla.redhat.com/2373020
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report
https://bugzilla.redhat.com/2373309
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report
https://bugzilla.redhat.com/2379374
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report
https://bugzilla.redhat.com/2379382
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report
https://bugzilla.redhat.com/2379386
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advisory
https://errata.almalinux.org/10/ALSA-2025-14178.html