Tomcat EncryptInterceptor Padding Oracle (before 11.0.19)
CVE-2026-29146 Published on April 9, 2026
Apache Tomcat: EncryptInterceptor vulnerable to padding oracle attack by default
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.
Vulnerability Analysis
CVE-2026-29146 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a high impact on confidentiality, with no impact on integrity and availability.
Weakness Types
Generation of Error Message Containing Sensitive Information
The software generates an error message that includes sensitive information about its environment, users, or associated data.
External Control of Critical State Data
The software stores security-critical state information about its users, or the software itself, in a location that is accessible to unauthorized actors.
Products Associated with CVE-2026-29146
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Affected Versions
Apache Software Foundation Apache Tomcat:- Version 11.0.0-M1, <= 11.0.18 is affected.
- Version 10.0.0-M1, <= 10.1.52 is affected.
- Version 9.0.13, <= 9.0.115 is affected.
- Version 8.5.38, <= 8.5.100 is affected.
- Version 7.0.100, <= 7.0.109 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.