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CVE-2026-86243— Apache Tomcat Native: DoS via TLS handshake

Quick assessment

Affected
Apache Software Foundation Apache Tomcat Native
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.

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versio

AI Predicted 5.9 Difficulty: Easy
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I. Basic Information for CVE-2026-86243

Vulnerability Information

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Vulnerability Title
Apache Tomcat Native: DoS via TLS handshake
Source: CVE Program / CVE List V5
Vulnerability Description
Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat Native 2.0.0 ~ 2.0.15 -

II. Public POCs for CVE-2026-86243

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III. Intelligence Information for CVE-2026-86243

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Mailing List Discussions for CVE-2026-86243 (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-2026-75973 Apache Tomcat: Cross-context authentication mix-up with Jakarta Authentication configured
CVE-2026-82331 Apache BuildStream: tar source extraction escape
CVE-2026-73192 Apache Sling XSS: XSS possible through XSSAPI.getValidHref()
CVE-2026-92001 Apache Sling XSS: Missing parser resource limits
CVE-2026-91999 Apache Sling XSS: Improper escaping in the XSS Webconsole plugin
CVE-2026-91852 Apache Sling XSS: CWE-79 multiple raw-string break-outs and ReDOS in XSSImpl
CVE-2026-96443 Apache Doris: JDBC driver URL validation bypass leads to remote code execution
CVE-2026-91928 Apache Sling XSS: Sanitizer bypass, uncontrolled resource consumption and failure pf prote
CVE-2026-94251 Apache Sling Security Bundle: ContentDispositionFilter mediates only one address/API shape
CVE-2026-94243 Apache Sling Security Bundle: RefererFilter accepts weaker-than-origin evidence
CVE-2026-73581 Apache Tomcat: OpenSSL and OpenSSL-FFM TLS implementations ignore CRLs when certificate us
CVE-2026-86247 Apache Tomcat Native: Client certificate requirements can be down-graded
CVE-2026-76183 Apache Tomcat: Bypass of security constraints for WebSocket endpoints
CVE-2026-77756 Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests
CVE-2026-77762 Apache Tomcat: Stale HPACK emitter injects trailers into recycled pooled Request
CVE-2026-77791 Apache Tomcat: DoS via busy wait during WebSocket close
CVE-2026-78383 Apache Tomcat: AJP DoS via missing request body
CVE-2026-78437 Apache Tomcat: HTTP/2 DoS via malformed request
CVE-2026-79677 Apache Tomcat: WebSocket DoS due to lost asynchronous write timeout

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

IV. Related Vulnerabilities

Same product: Apache Tomcat Native
Same vendor: Apache Software Foundation
Same weakness: CWE-126

V. Comments for CVE-2026-86243

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