CVE-2026-29146: Apache Tomcat: EncryptInterceptor vulnerable to padding oracle attack by default

Published Apr 9, 2026
·
Updated

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.

Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

Affected Software

7 affected components
Apache Tomcat>=11.0.0-M1<=11.0.18, >=10.0.0-M1<=10.1.52, >=9.0.13<=9.0.115, >=8.5.38<=8.5.100, >=7.0.100<=7.0.109
Apache Tomcat>=7.0.100<=7.0.109
Apache Tomcat>=8.5.38<=8.5.100
Apache Tomcat>=9.0.13<9.0.116
Apache Tomcat>=10.0.0<10.1.53
Apache Tomcat>=11.0.0<11.0.20
IBM API Connect V12 OnPrem<=All

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 11.0.19
  2. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 10.1.53
  3. Upgrade

    Upgrade Apache Tomcat to a version that resolves this vulnerability.

    Fixed in 9.0.116
  4. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch CVE-2026-29146
  5. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch CVE-2026-34486

Event History

Apr 9, 2026
CVE Published
via MITRE·07:21 PM
Data Sourced
via MITRE·07:21 PM
DescriptionWeakness
Data Sourced
via Red Hat·08:01 PM
DescriptionSeverityAffected Software
Data Sourced
via NVD·08:16 PM
DescriptionSeverityWeaknessAffected Software
Jul 7, 2026
Data Sourced
via IBM·12:00 AM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

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Frequently Asked Questions

1

What is the severity of CVE-2026-29146?

The severity of CVE-2026-29146 is critical due to its potential for unauthorized data access through padding oracle attacks.

2

How do I fix CVE-2026-29146?

To fix CVE-2026-29146, upgrade to Apache Tomcat version 11.0.19, 10.1.53, 9.0.116, 8.5.101, or 7.0.110 or later.

3

Which versions of Apache Tomcat are affected by CVE-2026-29146?

CVE-2026-29146 affects Apache Tomcat versions from 11.0.0-M1 through 11.0.18, 10.0.0-M1 through 10.1.52, and 9.0.13 through 9.0.115.

4

What type of attack does CVE-2026-29146 facilitate?

CVE-2026-29146 facilitates padding oracle attacks due to insecure default configurations in EncryptInterceptor.

5

Can CVE-2026-29146 be exploited remotely?

Yes, CVE-2026-29146 can be exploited remotely if the default configurations are used, allowing attackers to gain access to sensitive data.

Company

Resources

Contact

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CVE-2026-29146 - Apache Tomcat: EncryptInterceptor vulnerable to padding oracle attack by default - SecAlerts