Low 3.7Published Sep 23, 2026

CVE-2026-77756Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests

Updated under an hour ago (2026-10-19 13:10 UTC)

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It affects Apache Software Foundation Apache Tomcat. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Apache Software Foundation Apache Tomcat

Exploited in the last 30 days

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.

CVSS: 3.7 LOW (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: apache
NVD analysis: Awaiting Analysis
Record last updated: Sep 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Apache Software Foundation Apache Tomcat apache_software_foundation:apache_tomcat (from the name)	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; from 8.5.67 through 8.5.100; through 7.0.109 not affected	CNA record

References

https://lists.apache.org/thread/bl5b6rxqh3vb2k9bj2794vhor7o6xl3zvendor-advisory
http://www.openwall.com/lists/oss-security/2026/09/23/22

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.