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[ CVE-2026-103119 · Published 20 Oct 2026 ]

Vulnerability in Apache Software Foundation Apache Tomcat

CVSS 9.1 EPSS <1%2 agency advisoriesFix available

[ Why it matters ]Priority signals

  • Critical severity: CVSS 9.1

[ Description ]Official description

Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second. This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26. Users are recommended to upgrade to version 11.0.27, which fixes the issue.

[ Fixes ]Fixes and patches

[ Advisories ]Government CERT advisories

  • CERT-FRCERTFR-2026-AVI-1358

    Multiple vulnerabilities in Apache Tomcat Translated from French

    Multiple vulnerabilities have been discovered in Apache Tomcat. Some of them allow an attacker to cause a breach of data confidentiality, a security policy bypass and a security problem not specified by the vendor.

    CVE-2026-65183CVE-2026-88041CVE-2026-80353+6 more CVEs
  • BSI CERT-BundWID-SEC-2026-4066

    Apache Tomcat: Multiple vulnerabilities Translated from German

    CVE-2026-101356CVE-2026-88041CVE-2026-80353+5 more CVEs

[ References ]References