CVE-2026-77756
tomcat: Apache Tomcat: Request smuggling vulnerability can lead to denial of service
Severity
LowRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 23, 2026
Updated · November 2, 2026
Description
A flaw was found in Apache Tomcat. This vulnerability, known as HTTP Request/Response Smuggling, occurs when Tomcat processes the transfer-encoding header for an HTTP/1.0 request while operating behind a reverse proxy. A remote attacker could exploit this to cause a denial of service, leading to one user's request failing due to interference from another user's request.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CWE-444 · Inconsistent Interpretation of HTTP Requests