Description
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-M1 through 11.0.25, from 10.1.0-M1 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.
Published: 2026-09-23
Score: 3.7 Low
EPSS: n/a
KEV: No
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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Wed, 23 Sep 2026 14:45:00 +0000

Type Values Removed Values Added
First Time appeared Apache
Apache tomcat
Vendors & Products Apache
Apache tomcat

Wed, 23 Sep 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Wed, 23 Sep 2026 11:45:00 +0000

Type Values Removed Values Added
Description 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-M1 through 11.0.25, from 10.1.0-M1 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.
Title Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests
Weaknesses CWE-444
References

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-09-23T18:10:42.842Z

Reserved: 2026-08-21T09:55:42.227Z

Link: CVE-2026-77756

cve-icon Vulnrichment

Updated: 2026-09-23T13:18:12.690Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-23T12:17:06.663

Modified: 2026-09-23T17:58:26.570

Link: CVE-2026-77756

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T16:00:08Z

Weaknesses