CVE-2026-88041
Description
A flaw was found in Apache Tomcat. Due to an incomplete cleanup vulnerability, HTTP (Hypertext Transfer Protocol) trailer headers from a previous request can persist and leak into a subsequent request processed on the same connection. This issue may allow a remote user to access sensitive request data belonging to another client, resulting in information disclosure.
Statement
A flaw was found in Apache Tomcat. Due to incomplete object cleanup during request recycling, HTTP trailer headers from an earlier request can persist and leak into a subsequent request processed on the same persistent connection. An unauthenticated remote attacker sharing a connection pool or backend keep-alive channel could potentially access sensitive trailer metadata sent by other clients, resulting in minor information disclosure within the context of the running Tomcat server.
Mitigation
Configure front-end reverse proxies to strip HTTP trailer headers and disable backend persistent connection pooling, or set maxKeepAliveRequests="1" on Tomcat HTTP connectors to force separate connections for each request.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | High |
| Integrity Impact | None | N/A | None |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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