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CVE-2026-78383— Apache Tomcat: AJP DoS via missing request body

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 中存在资源分配无限制或无速率控制漏洞，攻击者无需认证即可通过 AJP 请求使 AJP 处理线程被长期占用，从而导致拒绝服务（Denial of Service）。 受影响版本包括： Apache Tomcat 11.0.0-M1 至 11.0.25 Apache Tomcat 10.1.0-M1 至 10.1.59 Apache Tomcat 9.0.0-M1 至 9.0.121 以下版本在 CVE 创建时已停止维护（EOL），但已知仍受影响： Apache Tomcat 8.5.0 至

AI Predicted 5.3 Difficulty: Trivial EPSS 0.50% · P43

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood

Affected Version Matrix 5

VendorProduct Version RangeStatus
Apache Software Foundation Apache Tomcat 11.0.0-M1≤ 11.0.25 affected
10.1.0-M1≤ 10.1.59 affected
9.0.0.M1≤ 9.0.121 affected
8.5.0≤ 8.5.100 affected
7.0.0≤ 7.0.109 affected
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I. Basic Information for CVE-2026-78383

Vulnerability Information
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Vulnerability Title
Apache Tomcat: AJP DoS via missing request body
Source: CVE Program / CVE List V5
Vulnerability Description
Allocation of resources without limits or throttling vulnerability in Apache Tomcat allows an unauthenticated AJP request to pin an AJP processing thread leading to denial of service. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.25 -

II. Public POCs for CVE-2026-78383

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III. Intelligence Information for CVE-2026-78383

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Mailing List Discussions for CVE-2026-78383 (1)

Same Patch Batch · Apache Software Foundation · 2026-09-23 · 25 CVEs total

CVE-2026-31377 7.5 HIGH Apache Doris: Improper Authentication Allows Unauthorized Access to FE Meta Service
CVE-2026-86247 Apache Tomcat Native: Client certificate requirements can be down-graded
CVE-2026-82331 Apache BuildStream: tar source extraction escape
CVE-2026-86246 Apache Tomcat Native: Insecure OpenSSL options enabled
CVE-2026-86243 Apache Tomcat Native: DoS via TLS handshake
CVE-2026-87022 Apache Tomcat: WebSocket message smuggling with per-message-deflate
CVE-2026-86350 Apache Tomcat: Regression in fix for CVE-2026-41293 can trigger request header mix-up
CVE-2026-86248 Apache Tomcat: Fix for CVE-2026-34500 was incomplete. OCSP checks sometimes soft-fail with
CVE-2026-79677 Apache Tomcat: WebSocket DoS due to lost asynchronous write timeout
CVE-2026-78437 Apache Tomcat: HTTP/2 DoS via malformed request
CVE-2026-77791 Apache Tomcat: DoS via busy wait during WebSocket close
CVE-2026-77762 Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request
CVE-2026-77756 Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests
CVE-2026-76183 Apache Tomcat: Bypass of security constraints for WebSocket endpoints
CVE-2026-75973 Apache Tomcat: Cross-context authentication mix-up with Jakarta Authentication configured
CVE-2026-73581 Apache Tomcat: OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate us
CVE-2026-94243 Apache Sling Security Bundle: RefererFilter accepts weaker-than-origin evidence
CVE-2026-94251 Apache Sling Security Bundle: ContentDispositionFilter mediates only one address/API shape
CVE-2026-91928 Apache Sling XSS: Sanitizer bypass, uncontrolled resource consumption and failure pf prote
CVE-2026-96443 Apache Doris: JDBC driver URL validation bypass leads to remote code execution

Showing top 20 of 25 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-770