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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.

以下是该漏洞描述信息的中文翻译： 不受控的资源消耗漏洞 Apache Tomcat 中存在一个不受控的资源消耗漏洞。该漏洞是由于在 HTTP/2 连接的回溯队列（backlog）跟踪中，当流被重置（stream reset）时存在分配泄漏（allocation leak）所致。 受影响版本包括： Apache Tomcat 11.0.0-M1 到 11.0.24 Apache Tomcat 10.1.0-M1 到 10.1.57 Apache Tomcat 9.0.39 到 9.0.120 以下版本在生成此 CVE

AI Predicted 5.3 Difficulty: Moderate EPSS 0.22% · P13

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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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

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

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III. Intelligence Information for CVE-2026-68763

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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

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-400

V. Comments for CVE-2026-68763

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