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Apache Tomcat CVE-2026-43515

| EUVDEUVD-2026-29519 CRITICAL
Improper Authorization (CWE-285)
2026-05-12 apache GHSA-5m62-pw8w-7w9f
Tomcat Authentication Bypass Apache Apache Tomcat
Critical
Disputed · 9.1 NVD
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Severity by source

Sources disagree (Medium–Critical)
NVD PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vuln.today AI
7.4 HIGH

Network, unauthenticated bypass (AV:N/PR:N) but requires a specific overlapping method-constraint configuration to be present, raising complexity to AC:H; high confidentiality/integrity impact, no availability effect.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
SUSE
CRITICAL
qualitative
Red Hat
5.4 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Jul 23, 2026 - 22:26 vuln.today
CVSS changed
May 14, 2026 - 20:22 NVD
9.1 (CRITICAL)
CVE Published
May 12, 2026 - 15:33 nvd
CRITICAL 9.1
CVE Published
May 12, 2026 - 15:33 nvd
UNKNOWN (no severity yet)

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 2 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (2 direct, 0 indirect)
  • 2 maven packages depend on org.apache.tomcat:tomcat-catalina (2 direct, 0 indirect)

Ecosystem-wide dependent count for version 10.1.0-M1 and other introduced versions.

DescriptionCVE.org

Improper Authorization vulnerability when multiple method constraints define an HTTP method for the same extension in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.21, from 10.1.0-M1 through 10.1.54, from 9.0.0.M1 through 9.0.117, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109.

Users are recommended to upgrade to version 11.0.22, 10.1.55 or 9.0.118 which fix the issue.

AnalysisAI

Authorization bypass in Apache Tomcat (versions 7.0.0-7.0.109, 8.5.0-8.5.100, 9.0.0.M1-9.0.117, 10.1.0-M1-10.1.54, and 11.0.0-M1-11.0.21) lets remote unauthenticated attackers reach protected resources when multiple security-constraint elements define an HTTP method for the same URL extension, causing method constraints to be misapplied. Per CVSS PR:N the flaw is exploitable without authentication, yielding high confidentiality and integrity impact but no availability impact (C:H/I:H/A:N). There is no public exploit identified at time of analysis; EPSS is very low (0.02%) and CISA SSVC records exploitation status as none, though the impact is rated total and the issue is automatable.

Technical ContextAI

Apache Tomcat is a widely deployed Java servlet container and web server implementing the Jakarta Servlet, JSP, and WebSocket specifications. The root cause is CWE-285 (Improper Authorization): Tomcat enforces access using web.xml <security-constraint> elements, each with <web-resource-collection> definitions that can list URL patterns (including extension patterns) and HTTP methods via <http-method> or <http-method-omission>. When more than one method constraint defines an HTTP method for the same extension-based mapping, Tomcat resolves the overlapping constraints incorrectly, so the intended authorization rule for a given method may not be applied. The affected component is Tomcat's security-constraint matching logic across the 7.0, 8.5, 9.0, 10.1, and 11.0 branches, identified by cpe:2.3:a:apache_software_foundation:apache_tomcat.

RemediationAI

Vendor-released patch: upgrade to Apache Tomcat 11.0.22, 10.1.55, or 9.0.118, which fix the issue; users on the end-of-life 8.5.x and 7.0.x branches should migrate to a supported fixed branch since no fixed 8.5/7.0 release is named in the advisory. Distribution users should apply the corresponding vendor packages via Red Hat RHSA-2026:13745 (https://access.redhat.com/errata/RHSA-2026:13745) and Ubuntu USN-8383-1 (https://ubuntu.com/security/notices/USN-8383-1). If immediate patching is not possible, the specific compensating control is to review each application's web.xml and eliminate overlapping security constraints where multiple <security-constraint>/<web-resource-collection> elements define the same HTTP method for the same extension pattern, consolidating them into a single unambiguous constraint; the trade-off is that reworking declarative security rules risks unintentionally loosening or tightening access and requires careful re-testing of authorized and unauthorized paths. The primary advisory is https://lists.apache.org/thread/746nxfxod0wsocxtmv8pb8nkgmwpc6bb.

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Vendor StatusVendor

SUSE

Severity: Critical
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed
SUSE Linux Enterprise Module for Web and Scripting 15 SP7 Fixed

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CVE-2026-43515 vulnerability details – vuln.today
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