CVE-2026-68763— Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset
Quick assessment
Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache Tomcat是美国Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.0-M1至11.0.24版本、10.1.0-M1至10.1.57版本、9.0.39至9.0.120版本和8.5.59至8.5.100版本存在资源管理错误漏洞，该漏洞源于HTTP/2 backlog跟踪中的分配泄漏，可能导致资源消耗不受控制。
Possible ATT&CK Techniques 1 AI
T1496 · Resource HijackingAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1≤ 11.0.24 |
affected |
10.1.0-M1≤ 10.1.57 |
affected | ||
9.0.39≤ 9.0.120 |
affected | ||
8.5.59≤ 8.5.100 |
affected | ||
≤ 7.0.109 |
unaffected |
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I. Basic Information for CVE-2026-68763
Vulnerability Information
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Vulnerability Title
Apache Tomcat: DoS via allocation leak in HTTP/2 backlog tracking when a stream is reset
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国Apache基金会的一个个Java Servlet容器。 Apache Tomcat 11.0.0-M1至11.0.24版本、10.1.0-M1至10.1.57版本、9.0.39至9.0.120版本和8.5.59至8.5.100版本存在资源管理错误漏洞，该漏洞源于HTTP/2 backlog跟踪中的分配泄漏，可能导致资源消耗不受控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | 11.0.0-M1 ~ 11.0.24 | - |
|
II. Public POCs for CVE-2026-68763
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-68763 (1)
Same Patch Batch · Apache Software Foundation · 2026-08-25 · 14 CVEs total
| CVE-2026-49050 | Apache DolphinScheduler: General user can mint admin access tokens via /access-tokens | |
| CVE-2026-53561 | Apache Hive: Unauthenticated authentication bypass in HiveServer2 HTTP SAML bearer-token v | |
| CVE-2026-55976 | Apache Hive: SSRF vulnerability in Hive Avro Serde due to Insufficient input validation on | |
| CVE-2026-49845 | Apache Hive: SQL Injection vulnerability in HiveMetaStore partition-name direct-SQL paths | |
| CVE-2026-65182 | Apache Tomcat: Bypass longest prefix security constraint | |
| CVE-2026-65183 | Apache Tomcat: TOCTOU when setting specific permissions for Unix Domain Sockets | |
| CVE-2026-65637 | Apache Tomcat: HTTP/2 no-authority bypass of strict SNI validation - CVE-2026-32990 fix in | |
| CVE-2026-65905 | Apache Tomcat: Limited replay attack possible with DIGEST authentication | |
| CVE-2026-65927 | Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control | |
| CVE-2026-66422 | Apache Tomcat: Servlet role references can bypass declarative role constraints | |
| CVE-2026-68525 | Apache Tomcat: Redirect after FORM auth may bypass method specific constraints | |
| CVE-2026-68569 | Apache Tomcat: Principal lookup can fail open in some cases | |
| CVE-2026-73180 | Apache Tomcat: Authenticated WebSocket session survives end of HTTP session |
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V. Comments for CVE-2026-68763
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