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.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache Tomcat | unaffected |
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| Vendor | Product | Confidence | Versions | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache | Tomcat | 95% |
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No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Wed, 23 Sep 2026 15:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
cvssV3_1
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Wed, 23 Sep 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Apache
Apache tomcat |
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| Vendors & Products |
Apache
Apache tomcat |
Wed, 23 Sep 2026 11:45:00 +0000
| Type | Values Removed | Values Added |
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| Description | 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. | |
| Title | Apache Tomcat: WebSocket message smuggling with per-message-deflate | |
| Weaknesses | CWE-130 | |
| References |
|
MITRE
Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-09-23T14:27:37.246Z
Reserved: 2026-09-08T17:16:33.368Z
Link: CVE-2026-87022
Vulnrichment
Updated: 2026-09-23T14:27:08.349Z
NVD
Status : Received
Published: 2026-09-23T12:17:08.640
Modified: 2026-09-23T15:17:22.927
Link: CVE-2026-87022
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-09-23T14:00:04Z
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CWE-130
Improper Handling of Length Parameter Inconsistency