Bug 2539396 (CVE-2026-77791) - CVE-2026-77791 tomcat: Apache Tomcat: Denial of Service via busy wait during WebSocket close
Summary: CVE-2026-77791 tomcat: Apache Tomcat: Denial of Service via busy wait during ...
Keywords:
Status: NEW
Alias: CVE-2026-77791
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 13:03 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 13:51:27 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 17:37:08 UTC
Red Hat Product Errata RHSA-2026:96229 0 None None None 2026-11-09 17:33:25 UTC

Description OSIDB Bzimport 2026-09-23 13:03:01 UTC 
Uncontrolled Resource Consumption vulnerability in Apache Tomcat during sending of WebSocket close message enabled a DoS attack.



This issue affects Apache Tomcat: from 11.0.0-M5 through 11.0.25, from 10.1.8 through 10.1.59, from 9.0.74 through 9.0.121.



The following versions were EOL at the time the CVE was created but are 
known to be affected: from 8.5.88 through 8.5.100. 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 13:50:03 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 13:51:26 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 17:33:16 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 17:36:58 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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