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CVE-2026-87022

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

Published
Last modified
published
Not listed in CISA KEV
Low (apache)
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Apache Software Foundation 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; From 8.5.0 · through 8.5.100; From 7.0.56 · through 7.0.109

References 1

lists.apache.org