CVE-2026-68763
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
CVE-2026-68763: Uncontrolled Resource Consumption vulnerability in Apache Tomcat via an allocation leak in the HTTP/2 backlog tracking when a stream is reset…
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
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CVE-2026-68763 key facts
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- High
- CVSS base score
- 7.5 (Apache), 7.5 (NetApp), 7.5 (Red Hat)
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H(Red Hat)
- Weakness
- CWE-770
- Fixed releases
- Apache: 11.0.25, 10.1.58, 9.0.121
- Red Hat: 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 and 7 more in the advisory
- VulniPulse record
- Published · Updated
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-68763; bulletin-wide values are not repeated here.
Is CVE-2026-68763 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-68763 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-68763?
Upgrade to a fixed release named by the vendor:
- Apache: 11.0.25, 10.1.58, 9.0.121
- Red Hat: 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
- Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue. (Apache)
- 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 element within the 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. (Red Hat)
Vendor advisory comparison
Apache
1 advisory- Advisory severityHigh7.5
High [CVE-2026-68763] 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
CVE-2026-68763Source published Source updated
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.
- Affected products in this advisory
- Apache Tomcat
- Source-reported affected versions
- 11.0.0-M1 through 11.0.24
- 10.1.0-M1 through 10.1.57
- 9.0.39 through 9.0.120.
- 8.5.59 through 8.5.100.
2 more entries in the full advisory.
- Source-reported fixed versions
- 11.0.25
- 10.1.58
- 9.0.121
- Mitigation guidance
- Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121, which fix the issue.
NetApp
1 advisory- Advisory severityHigh7.5
High [CVE-2026-68763] Apache Tomcat Vulnerability in NetApp Products
NTAP-20260902-0019Source published Source updated
Apache Tomcat versions 11.0.0-M1 through 11.0.24, 10.1.0-M1 through 10.1.57, 9.0.39 through 9.0.120, and 8.5.59 through 8.5.100 (EOL) are susceptible to a vulnerability which when successfully exploited could lead to Denial of Service (DoS). Successful exploitation of this vulnerability could lead to Denial of Service (DoS). NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.
- Affected products in this advisory
- No product details extracted. Check the source bulletin.
- Source-reported affected versions
- 11.0.0
- 11.0.24
- 10.1.0
- 10.1.57
4 more entries in the full advisory.
- Source-reported fixed versions
- No fixed-version detail extracted. This does not mean no fix exists.
- Mitigation guidance
- No mitigation guidance extracted; consult the source.
Red Hat
1 advisory- Advisory severityHigh7.5
High [CVE-2026-68763] Denial of Service via HTTP/2 allocation leak
CVE-2026-68763Source published Source updated
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…
- Affected products in this 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
11 more entries in the full advisory.
- Source-reported affected versions
- 11.0.0
- 11.0.24
- 10.1.0
- 10.1.57
4 more entries in the full advisory.
- Source-reported fixed versions
- 11.0.25
- 10.1.58
- 9.0.121
- tomcat
9 more entries in the full advisory.
- Mitigation guidance
- 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.
More Apache advisories
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- CVE-2026-101296Oct 20, 2026missing critical step in authentication vulnerability in Apache Tomcat when the JNDI realm
- CVE-2026-93446Oct 20, 2026Incomplete cleanup vulnerability in Apache Tomcat could cause TLS 1.3 connections to fail
- CVE-2026-88041Oct 20, 2026Incomplete cleanup vulnerability in Apache Tomcat allowed an trailer information
- CVE-2026-80353Oct 20, 2026Time-of-check time-of-use (TOCTOU) race condition vulnerability in Apache Tomcat
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