Multiple Vulnerabilities Found in Apache Tomcat, Four Rated Critical by CISA
Apache Tomcat has been updated to address 11 vulnerabilities, with four issues receiving a Critical rating from CISA despite lower severity assessments from the Apache development team.
The releases of Apache Tomcat 11.0.25, 10.1.59, and 9.0.121 were issued between August 18 and 20, 2026. These updates cover the previously disclosed CVE-2026-66299 along with ten additional flaws made public on August 25.
Important-rated vulnerabilities
The development team classified four vulnerabilities as Important. CVE-2026-65182 allows bypass of stricter security restrictions due to evaluation order of path-based rules. CVE-2026-65927 stems from an off-by-one error that can bypass access controls. CVE-2026-68569 permits authentication of non-existent users under certain authentication methods. CVE-2026-68763 causes resource leaks when resetting HTTP/2 streams, enabling denial-of-service conditions.
One Moderate and six Low severity issues were also resolved in the same updates.
CISA severity assessments
CISA’s CVSS v3.1 base scores differ from the vendor ratings. CVE-2026-65637 and CVE-2026-65905 received scores of 9.8, while CVE-2026-65182 and CVE-2026-68525 scored 9.1, placing all four in the Critical category. The Apache team had rated these as Moderate, Low, Important, and Low respectively.
The full list of addressed CVEs includes: CVE-2026-65182, CVE-2026-65183, CVE-2026-65637, CVE-2026-65905, CVE-2026-65927, CVE-2026-66299, CVE-2026-66422, CVE-2026-68525, CVE-2026-68569, CVE-2026-68763, and CVE-2026-73180.
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