Padding Oracle Vulnerability in Apache Tomcat by the Apache Software Foundation
CVE-2026-29146

7.5HIGH

Key Information:

Vendor

Apache
Status
Apache Tomcat
Vendor
CVE Published:
9 April 2026

What is CVE-2026-29146?

A Padding Oracle vulnerability in the EncryptInterceptor component of Apache Tomcat poses a significant risk to data encryption mechanisms. This flaw exists when Tomcat is operated with its default configuration, potentially allowing attackers to exploit weaknesses in data encryption processes. Users are encouraged to upgrade to the patched versions (11.0.19, 10.1.53, and 9.0.116) to mitigate the risks associated with this vulnerability.

Affected Version(s)

Apache Tomcat 11.0.0-M1 <= 11.0.18

Apache Tomcat 10.0.0-M1 <= 10.1.52

Apache Tomcat 9.0.13 <= 9.0.115

References

https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xyg...
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Uri Katz and Avi Lumelsky (Oligo Security)
.