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Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests

Type: advisorySource: OSV1 source record

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0 through 11.0.25, from 10.1.0 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Announced Source revision 1
Original source ↗

BIT-tomcat-2026-77756

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-2026-77756

tomcat

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
9.0.45

Source reference: /affected/0/ranges

9.0.122

Source reference: /affected/0/ranges

10.1.60

Source reference: /affected/0/ranges

11.0.26

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": "8.5.67"
          },
          {
            "fixed": "9.0.45"
          },
          {
            "introduced": "9.0.47"
          },
          {
            "fixed": "9.0.122"
          },
          {
            "introduced": "10.1.0"
          },
          {
            "fixed": "10.1.60"
          },
          {
            "introduced": "11.0.0"
          },
          {
            "fixed": "11.0.26"
          }
        ]
      }
    ],
    "package": {
      "name": "tomcat",
      "purl": "pkg:bitnami/tomcat",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V3",
        "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/tomcat/BIT-tomcat-2026-77756.json"
    }
  }
]
Related CVEs
CVE-2026-77756

Source reference: /aliases

Publisher severity

low

Source reference: /database_specific/severity

Event
#59559 · Revision 1
Added to Heist Feed
Publisher date
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