CVE-2026-87022
Apache Tomcat: WebSocket message smuggling with per-message-deflate
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-130 |
| Vendor | apache software foundation |
| Product | apache tomcat |
| Published | Sep 23, 2026 |
| Last Updated | Sep 23, 2026 |
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Affected Versions
Apache Software Foundation / Apache Tomcat
11.0.0-M1 ≤ 11.0.25 10.1.0-M1 ≤ 10.1.59 9.0.0.M1 ≤ 9.0.121 8.5.0 ≤ 8.5.100 7.0.56 ≤ 7.0.109
References
Credits
krsecurity(kongr)