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

Type: advisorySource: OSV1 source record

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 through 11.0.25, from 10.1.0 through 10.1.59, from 9.0.0 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.

Announced Source revision 1
Original source ↗

BIT-tomcat-2026-87022

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-tomcat-2026-87022

tomcat

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
9.0.45

Source reference: /affected/0/ranges

10.1.60

Source reference: /affected/0/ranges

11.0.26

Source reference: /affected/0/ranges

9.0.122

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "7.0.56"
          },
          {
            "fixed": "9.0.45"
          },
          {
            "introduced": "10.1.0"
          },
          {
            "fixed": "10.1.60"
          },
          {
            "introduced": "11.0.0"
          },
          {
            "fixed": "11.0.26"
          },
          {
            "introduced": "9.0.0"
          },
          {
            "fixed": "9.0.122"
          }
        ]
      }
    ],
    "package": {
      "name": "tomcat",
      "purl": "pkg:bitnami/tomcat",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V3",
        "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/tomcat/BIT-tomcat-2026-87022.json"
    }
  }
]
Related CVEs
CVE-2026-87022

Source reference: /aliases

Publisher severity

high

Source reference: /database_specific/severity

Event
#59556 · Revision 1
Added to Heist Feed
Publisher date
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