Riskcovery

CVE-2026-87022

Apache Tomcat: WebSocket message smuggling with per-message-deflate

State
Published
Severity
7.5 High
Published
Sep 23, 2026
Updated
Sep 23, 2026
Reserved
Sep 8, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NCISA-ADP

Weaknesses

  • CWE-130 Improper handling of length parameter inconsistency

Affected Products

ProductVersions
Apache TomcatApache Software Foundation
  • 11.0.0-M1 through 11.0.25Affected
  • 10.1.0-M1 through 10.1.59Affected
  • 9.0.0.M1 through 9.0.121Affected
  • 8.5.0 through 8.5.100Affected
  • 7.0.56 through 7.0.109Affected

References

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