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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-68763] Denial of Service via HTTP/2 allocation leak

This high-severity Red Hat Linux advisory covers CVE-2026-68763 affecting Red Hat JBoss Web Server 6.2.5, Red Hat JBoss Web Server 6.2 on RHEL 10, Red Hat JBoss Web Server 6.2 on RHEL 8.

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CVE-2026-68763 Source published Source updated

VulniPulse record published Record updated

CVE-2026-68763
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

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Summary

Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.39 through 9.0.120.

The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue. A remote attacker could exploit this to cause a Denial of Service (DoS), making the server unresponsive or unavailable to users.

This Important flaw in Apache Tomcat, as shipped with Red Hat JBoss Web Server, allows a remote, unauthenticated attacker to cause a denial of service. The vulnerability stems from an allocation leak in the HTTP/2 backlog tracking, which can be triggered by resetting an HTTP/2 stream, leading to resource exhaustion and service unavailability.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770.

Affected products named by the advisory: Red Hat JBoss Web Server 6.2.5; 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; and 11 more.

Affected versions
  • 11.0.0
  • 11.0.24
  • 10.1.0
  • 10.1.57
  • 9.0.39
  • 9.0.120
  • 8.5.59
  • 8.5.100

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

Fixed versions
  • 11.0.25
  • 10.1.58
  • 9.0.121
  • tomcat
  • jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws
  • jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws
  • jws6-tomcat-0:10.1.49-16.redhat_00016.1.el9jws
  • tomcat11-main-11.0.25-0.1.hum1
  • tomcat10-main-10.1.59-0.1.hum1
  • RHSA-2026:73982
  • RHSA-2026:73981
  • RHSA-2026:56039
  • RHSA-2026:63137

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • To mitigate this vulnerability, disable the HTTP/2 protocol in Apache Tomcat if it is not required for your deployment. This can be achieved by commenting out or removing the <UpgradeProtocol className="org.apache.coyote.http2.Http2Protocol" /> element within the <Connector> configuration in the server.xml file. After modifying server.xml, a restart of the Apache Tomcat service is required for the changes to take effect.

Official advisory · high-confidence parse· fetched 21 days ago·verify at source

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