CVE-2026-55276: Apache Tomcat has an Always-Incorrect Control Flow Implementation vulnerability

Published Jun 29, 2026
·
Updated

Always-Incorrect Control Flow Implementation vulnerability in Apache Tomcat meant that special roles and empty authorisation constraints were not included when the effective web.xml was logged.

Affected Software

45 affected componentsFixes available
Apache Tomcat>=11.0.0-M1<=11.0.22
Apache Tomcat>=10.1.0-M1<=10.1.55
Apache Tomcat>=9.0.0.M1<=9.0.118
Apache Tomcat>=8.5.0<=8.5.100
Apache Tomcat<9.0.119
Apache Tomcat>=10.1.0<10.1.56
Apache Tomcat>=11.0.0<11.0.23
debian/tomcat10<=10.1.55-1~deb12u1, <=10.1.55-1~deb13u1, <=10.1.55-1
debian/tomcat11<=11.0.22-1~deb13u1, <=11.0.22-2
debian/tomcat9<=9.0.43-2~deb11u10
9.0.118-0+deb11u19.0.70-29.0.95-19.0.118-1
IBM Guardium Data Protection<=12.1
IBM Guardium Data Protection<=12.2
maven/org.apache.tomcat.embed:tomcat-embed-core>=11.0.0-M1<11.0.23
11.0.23
maven/org.apache.tomcat.embed:tomcat-embed-core>=10.1.0-M1<10.1.56
10.1.56
maven/org.apache.tomcat.embed:tomcat-embed-core>=9.0.0.M1<9.0.119
9.0.119
maven/org.apache.tomcat.embed:tomcat-embed-core>=8.5.0<=8.5.100
maven/org.apache.tomcat:tomcat>=11.0.0-M1<11.0.23
11.0.23
maven/org.apache.tomcat:tomcat>=10.1.0-M1<10.1.56
10.1.56
maven/org.apache.tomcat:tomcat>=9.0.0.M1<9.0.119
9.0.119
maven/org.apache.tomcat:tomcat>=8.5.0<=8.5.100
maven/org.apache.tomcat:tomcat-util-scan>=11.0.0-M1<11.0.23
11.0.23
maven/org.apache.tomcat:tomcat-util-scan>=10.1.0-M1<10.1.56
10.1.56
maven/org.apache.tomcat:tomcat-util-scan>=9.0.0.M1<9.0.119
9.0.119
maven/org.apache.tomcat:tomcat-util-scan>=8.5.0<=8.5.100
bitnami/tomcat<9.0.119
9.0.119
bitnami/tomcat>=10.0.0<10.1.56
10.1.56
bitnami/tomcat>=11.0.0<11.0.23
11.0.23
ubuntu/tomcat7*
ubuntu/tomcat8<8.0.32-1ubuntu1.13+esm2
8.0.32-1ubuntu1.13+esm2
ubuntu/tomcat7*
ubuntu/tomcat8<8.5.39-1ubuntu1~18.04.3+esm6
8.5.39-1ubuntu1~18.04.3+esm6
ubuntu/tomcat9*
ubuntu/tomcat9*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat11*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat11*
ubuntu/tomcat9*
ubuntu/tomcat10*
ubuntu/tomcat9*
ubuntu/tomcat11*

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/tomcat9 to a version that resolves this vulnerability.

    Fixed in 9.0.118-0+deb11u1Fixed in 9.0.70-2Fixed in 9.0.95-1Fixed in 9.0.118-1
  2. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 11.0.23
  3. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 10.1.56
  4. Upgrade

    Upgrade maven/org.apache.tomcat.embed:tomcat-embed-core to a version that resolves this vulnerability.

    Fixed in 9.0.119
  5. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.23
  6. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.56
  7. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.119
  8. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat-util-scan to a version that resolves this vulnerability.

    Fixed in 11.0.23
  9. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat-util-scan to a version that resolves this vulnerability.

    Fixed in 10.1.56
  10. Upgrade

    Upgrade maven/org.apache.tomcat:tomcat-util-scan to a version that resolves this vulnerability.

    Fixed in 9.0.119
  11. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.119
  12. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.56
  13. Upgrade

    Upgrade bitnami/tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.23
  14. Upgrade

    Upgrade ubuntu/tomcat8 to a version that resolves this vulnerability.

    Fixed in 8.0.32-1ubuntu1.13+esm2
  15. Upgrade

    Upgrade ubuntu/tomcat8 to a version that resolves this vulnerability.

    Fixed in 8.5.39-1ubuntu1~18.04.3+esm6
  16. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.23
  17. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.56
  18. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.119

Event History

Jun 29, 2026
CVE Published
via MITRE·08:42 PM
Data Sourced
via MITRE·08:42 PM
DescriptionWeakness
Data Sourced
via OSV·08:42 PM
DescriptionSeverityWeakness
Data Sourced
via Red Hat·09:02 PM
DescriptionSeverityAffected Software
Data Sourced
via OSV·09:16 PM
Affected Software
Data Sourced
via NVD·09:16 PM
DescriptionSeverityWeaknessAffected Software
Advisory Published
via OSV·09:32 PM
Oct 14, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

What is the severity of CVE-2026-55276?

CVE-2026-55276 has a risk rating of 30, indicating a significant impact on security.

2

How do I fix CVE-2026-55276?

To fix CVE-2026-55276, upgrade your Apache Tomcat to version 11.0.23, 10.1.56, or 9.0.80 or later.

3

Which Apache Tomcat versions are affected by CVE-2026-55276?

CVE-2026-55276 affects Apache Tomcat versions from 11.0.0-M1 through 11.0.22, 10.1.0-M1 through 10.1.55, and earlier versions in the 9.0 series.

4

What specific issue does CVE-2026-55276 address?

CVE-2026-55276 addresses an Always-Incorrect Control Flow Implementation vulnerability that results in incomplete logging of authorization constraints.

5

How does CVE-2026-55276 impact application security?

CVE-2026-55276 can lead to insufficient authorization visibility, which may expose applications to unauthorized access due to incomplete logging.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203