Cyber Resilience

CVE-2026-53404

Apache Tomcat 8.5.0 – 8.5.100

Published
29 June 2026
Modified
02 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
EPSS Score 0.0058 44th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-53404 is a high-severity Always-Incorrect Control Flow Implementation (CWE-670) vulnerability in Apache Tomcat. Its CVSS base score is 7.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 44th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SI-2 (Flaw Remediation) and CM-6 (Configuration Settings) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat's rewrite valve meant that if the first condition in an OR chain matched, subsequent non-OR conditions were skipped. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.22, from 10.1.0-M1 through 10.1.55, from…

more

9.0.0.M1 through 9.0.118, from 8.5.0 through 8.5.100. Other versions that have reached end of support may also be affected. Users are recommended to upgrade to version 11.0.23, 10.1.56 or 9.0.119, which fix the issue.

CWE(s)
CWE-670

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Logic flaw in Tomcat rewrite valve condition evaluation can be exploited to bypass intended access/rewrite rules on a public-facing server.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-55276Same product: Apache Tomcat
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CVE-2026-43515Same product: Apache Tomcat
CVE-2026-55957Same product: Apache Tomcat
CVE-2025-66614Same product: Apache Tomcat
CVE-2026-34486Same product: Apache Tomcat
CVE-2026-55956Same product: Apache Tomcat
CVE-2026-32990Same product: Apache Tomcat
CVE-2026-29146Same product: Apache Tomcat

Affected Assets

apache
tomcat
8.5.0 — 8.5.100 · 9.0.0 — 9.0.119 · 10.1.0 — 10.1.56

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)
  • SI-2 Flaw Remediation
  • CM-6 Configuration Settings
Detect
Catch it (NIST detect / respond)
  • SI-4 System Monitoring
Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V9.2.1

Mitigating Controls (NIST 800-53 r5) AI

SI-2 Flaw Remediation good match
prevent

Directly requires applying the vendor-supplied patches that correct the rewrite-valve control-flow flaw.

CM-6 Configuration Settings partial match
prevent

Enforces secure baseline settings for the rewrite valve (or its disablement) so that the defective OR-chain logic is never exercised.

SI-4 System Monitoring partial match
detect

Monitors web-server behavior and rewrite-rule outcomes to identify requests that bypass intended non-OR conditions.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly prevent incorrect control-flow implementations via reviews, testing, and static analysis.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development and acceptance can detect paths that deviate from intended logic.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle processes can catch incorrect control-flow logic during design and code review.

A.8.28 Secure coding partial match
prevents

Secure coding standards and reviews directly target flawed control-flow implementations.

A.8.32 Change management partial match
prevents

Change-management gates may prevent deployment of flawed logic but do not address the coding defect itself.

References