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CVE-2026-68763

Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset

HIGH
7.5
CVSS Score
Published: August 25, 2026 at 10:00 PM UTC
Updated: August 27, 2026 at 01:21 PM UTC
1 product affected across 1 vendorTomcat

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tomcat· Apache
95%
10.1.0 ≤ v < 10.1.5810.1.0-M1 ≤ v ≤ 10.1.5711.0.0 ≤ v < 11.0.2511.0.0-M1 ≤ v ≤ 11.0.248.5.59 ≤ v ≤ 8.5.1008.5.59 ≤ v < 9.0.1219.0.39 ≤ v ≤ 9.0.12010.1.0-M111.0.0-M18.5.599.0.39
Affected range stops below 10.1.58, so it looks safe — our inference, not a vendor statement
Affected range stops below 11.0.25, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 7.0.109 (unaffected)
Affected range stops below 9.0.121, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor AdvisoryMailing List
Source: cverecord
https://lists.apache.org/thread/tv51ty39ppv41v04hdtkp9dp7tg02nzl
Third Party AdvisoryMailing List
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/08/26/9

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-400

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