Riskcovery

CVE-2026-77756

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

State
Published
Severity
3.7 Low
Published
Sep 23, 2026
Updated
Sep 23, 2026
Reserved
Aug 21, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.13.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:LCISA-ADP

Weaknesses

  • CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Affected Products

ProductVersions
Apache TomcatApache Software Foundation
  • 11.0.0-M1 through 11.0.25Affected
  • 10.1.0-M1 through 10.1.59Affected
  • 9.0.47 through 9.0.121Affected
  • 8.5.67 through 8.5.100Affected
  • 7.0.109 and earlierNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.