CVE-2026-53404
Description
A flaw was found in Apache Tomcat's rewrite valve. This vulnerability involves an incorrect control flow implementation where, during the processing of rewrite rules, if the first condition in an OR chain matched, subsequent non-OR conditions were unexpectedly skipped. This can lead to unintended rule processing, potentially allowing for security bypasses or unauthorized access due to misapplied configurations.
Statement
A flaw was found in Apache Tomcat's RewriteValve. When rewrite rules use OR-chained conditions followed by non-OR conditions, the processing logic may not evaluate conditions correctly, potentially allowing unintended rule matches. Exploitation requires the RewriteValve to be enabled with specific OR-chained condition patterns, which is not a default configuration.
Mitigation
This vulnerability only affects Tomcat deployments that use the RewriteValve with OR-chained rewrite conditions. Deployments that do not use the RewriteValve are not affected. Review rewrite rules for OR-chained conditions and test rule evaluation behavior.
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 | 6.5 | N/A | 7.3 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | None | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
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