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Apache Tomcat CVE-2026-87022

| EUVDEUVD-2026-85236 HIGH
Improper Handling of Length Parameter Inconsistency (CWE-130)
2026-09-23 apache GHSA-xwrc-v28h-528j
Apache Java Information Disclosure Red Hat Tomcat Suse Apache Tomcat Apache Software Foundation
7.5
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.5 LOW
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
vuln.today AI
3.7 LOW

Remote unauthenticated, but AC:H because it requires an app deploying WebSocket endpoints with per-message-deflate; integrity-only smuggling, I:L given partial technical impact per SSVC.

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

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

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

Lifecycle Timeline

7
Analysis Updated
Sep 23, 2026 - 15:27 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Sep 23, 2026 - 15:22 vuln.today
cvss_changed
Severity Changed
Sep 23, 2026 - 15:22 NVD
LOW HIGH
CVSS changed
Sep 23, 2026 - 15:22 NVD
7.5 (LOW) 7.5 (HIGH)
Metadata Corrected
Sep 23, 2026 - 12:40 vuln.today
tag: Java added
Analysis Generated
Sep 23, 2026 - 12:19 vuln.today
CVE Published
Sep 23, 2026 - 11:32 cve.org
LOW

DescriptionCVE.org

Improper handling of length parameter inconsistency vulnerability in Apache Tomcat allows WebSocket message smuggling when per-message-deflate is used.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.0.M1 through 9.0.121.

The following versions were EOS at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.56 through 7.0.109. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.1.22, which fix the issue.

AnalysisAI

WebSocket message smuggling in Apache Tomcat allows a remote, unauthenticated attacker to inject or reorder messages within a compressed WebSocket stream, corrupting application-level message boundaries and undermining integrity of data exchanged over the connection. The flaw affects the 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, and 9.0.0.M1 through 9.0.121 release lines, plus the end-of-support 8.5.0-8.5.100 and 7.0.56-7.0.109 branches, but it only triggers when the per-message-deflate compression extension has been negotiated on the WebSocket connection; deployments that serve only standard HTTP or that run WebSocket endpoints without compression are not exposed. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires the target Tomcat instance to host a WebSocket application AND for the connection to use the per-message-deflate compression extension - the description explicitly states smuggling occurs 'when per-message-deflate is used.' Without negotiated compression on the WebSocket, the length-inconsistency primitive does not trigger. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but conditionally-gated integrity flaw rather than a drop-everything emergency. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: upgrade to Apache Tomcat 11.0.26, 10.1.60, or 9.1.22, which fix the issue; older 8.5.x and 7.0.x branches are end-of-support and will not receive a fix, so those deployments must migrate to a supported line. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, inventory all Apache Tomcat deployments, focusing on versions 11.0.0-M1 through 11.0.25, 10.1.0-M1 through 10.1.59, 9.0.0.M1 through 9.0.121, and end-of-support 8.5.0 through 8.5.100 and 7.0.56 through 7.0.109, and immediately disable the per-message-deflate WebSocket compression extension or block WebSocket upgrade requests where compression is not business-critical. …

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: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Module for Basesystem 15 SP7 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed

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CVE-2026-87022 vulnerability details – vuln.today
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