November 15, 2026

CVE Watchtower

CVE-2026-68763Apache Tomcat Uncontrolled Resource Consumption

NVDCVSS scored by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Vulnerability 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.
Severity Level
HIGH(7.5)
Published Date
Aug 25, 2026
Last Modified
Aug 27, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.74%Probability
Root Weakness (CWE)
CWE-400: Uncontrolled Resource Consumption ↗
The product does not properly control the allocation and maintenance of a limited resource, enabling denial-of-service conditions.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • Apache Tomcat >= 8.5.59 and < 9.0.121
  • Apache Tomcat >= 10.1.0 and < 10.1.58
  • Apache Tomcat >= 11.0.0 and < 11.0.25
Patched Versions
  • Apache Tomcat 9.0.121
  • Apache Tomcat 10.1.58
  • Apache Tomcat 11.0.25

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is high.

  1. Check whether you run Apache Tomcat and which version.
  2. Update to a patched version listed above, then confirm the new version.

Timeline

  • Aug 25, 2026Published
  • Aug 27, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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Related Coverage

More Apache Tomcat CVEs

External References

Data last checked: Nov 15, 2026 06:05 UTC