Bug 2539486 (CVE-2026-78383) - CVE-2026-78383 tomcat: Apache Tomcat: Denial of Service via AJP request
Summary: CVE-2026-78383 tomcat: Apache Tomcat: Denial of Service via AJP request
Keywords:
Status: NEW
Alias: CVE-2026-78383
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2543044
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-23 15:51 UTC by OSIDB Bzimport
Modified: 2026-11-09 17:37 UTC (History)
10 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:93618 0 None None None 2026-11-03 13:51:29 UTC
Red Hat Product Errata RHSA-2026:93622 0 None None None 2026-11-03 13:50:05 UTC
Red Hat Product Errata RHSA-2026:96228 0 None None None 2026-11-09 17:37:24 UTC
Red Hat Product Errata RHSA-2026:96229 0 None None None 2026-11-09 17:33:26 UTC

Description OSIDB Bzimport 2026-09-23 15:51:31 UTC 
Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service.



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 7.0.0 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.
Comment 2 Jon Orris 2026-11-03 13:50:04 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0.3

Via RHSA-2026:93622 https://access.redhat.com/errata/RHSA-2026:93622
Comment 3 Jon Orris 2026-11-03 13:51:28 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 7.0 on RHEL 10
  Red Hat JBoss Web Server 7.0 on RHEL 8
  Red Hat JBoss Web Server 7.0 on RHEL 9

Via RHSA-2026:93618 https://access.redhat.com/errata/RHSA-2026:93618
Comment 4 errata-xmlrpc 2026-11-09 17:33:18 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2.6

Via RHSA-2026:96229 https://access.redhat.com/errata/RHSA-2026:96229
Comment 5 errata-xmlrpc 2026-11-09 17:37:15 UTC 
This issue has been addressed in the following products:

  Red Hat JBoss Web Server 6.2 on RHEL 10
  Red Hat JBoss Web Server 6.2 on RHEL 8
  Red Hat JBoss Web Server 6.2 on RHEL 9

Via RHSA-2026:96228 https://access.redhat.com/errata/RHSA-2026:96228
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