OCTOBER 10, 2026
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Case File

CVE-2026-87022

HIGH · CVSS 7.5 EPSS 0.42%

Source: NVD + CISA KEV + EPSS · Published 2026-09-23 · Last synced 2026-10-10

CyberRota Analysis

AI-Generated

Apache Tomcat versions 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 are vulnerable to a message smuggling attack due to improper handling of length parameter inconsistencies when using per-message-deflate in WebSocket communications. This vulnerability can lead to unauthorized data access or manipulation, posing a significant risk to applications relying on these versions. Organizations using affected versions should prioritize upgrading to 11.0.26, 10.1.60, or 9.1.22 to mitigate this high-severity issue.

CVE
CVE-2026-87022
Severity
HIGH
CVSS
7.5
EPSS
0.42%
Apache

Original NVD 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.