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Apache Tomcat CVE-2026-42498

| EUVDEUVD-2026-29515 HIGH
Information Exposure (CWE-200)
2026-05-12 apache GHSA-fv25-8xcx-gqjc
Apache Information Disclosure Red Hat Tomcat Apache Tomcat
7.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
7.3 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
SUSE
HIGH
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

4
Analysis Generated
Jun 08, 2026 - 09:07 vuln.today
CVSS changed
May 13, 2026 - 16:22 NVD
7.3 (HIGH)
CVE Published
May 12, 2026 - 15:17 nvd
UNKNOWN (no severity yet)
CVE Published
May 12, 2026 - 15:17 nvd
HIGH 7.3

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

Exposure of HTTP Authentication Header to unexpected hosts during WebSocket authentication vulnerability 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 9.0.2 through 9.0.117, from 8.5.24 through 8.5.100, from 7.0.83 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

Information disclosure in Apache Tomcat versions 7.0.83 through 11.0.21 exposes HTTP authentication headers to unintended hosts during WebSocket authentication handshakes, enabling credential leakage to third-party endpoints. The flaw carries a CVSS 7.3 score with partial confidentiality, integrity, and availability impact, and no public exploit identified at time of analysis. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Identify Tomcat app making authenticated WebSocket calls
Delivery
Stand up attacker-controlled WebSocket host or redirector
Exploit
Induce vulnerable client to connect cross-host
Execution
Tomcat leaks HTTP Authorization header
Persist
Capture and replay credentials against original service
Impact
Access protected data or APIs
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Vulnerability AssessmentAI

Exploitation Exploitation requires that a Tomcat-hosted application acts as a WebSocket client (or otherwise initiates an authenticated WebSocket handshake) and that the connection traverses or is redirected to a host different from the one for which the HTTP Authorization header was minted; the attacker must control or observe that unexpected destination host. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Signals are mixed and lean toward moderate, opportunistic risk rather than priority-one. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker controlling or able to influence a WebSocket endpoint that a Tomcat-based client is induced to connect to (for example via a redirect from a legitimate host or a misconfigured URL in a server-to-server integration) receives the victim's HTTP Authorization header, including any Basic or Bearer credentials intended for the original host. The attacker then replays the captured credentials against the legitimate service to access protected APIs. …
Remediation Vendor-released patches are available: upgrade to Apache Tomcat 11.0.22, 10.1.55, or 9.0.118 on the supported branches, as documented in the Apache advisory at https://lists.apache.org/thread/n61zwf75jrv09rz90j4jssncm244bwdb and mirrored at http://www.openwall.com/lists/oss-security/2026/05/12/14. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Identify and inventory all Tomcat 7.0.83-11.0.21 instances; apply network restrictions or disable WebSocket services as interim protection. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

SUSE

Severity: High
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-2026-42498 vulnerability details – vuln.today
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