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Tomcat CVE-2026-29146

| EUVDEUVD-2026-21012 HIGH
Error Message Information Leak (CWE-209)
2026-04-09 apache GHSA-h468-7pvh-8vr8
Apache Information Disclosure Oracle Tomcat Apache Tomcat Apache Software Foundation
7.5
CVSS 3.1 · Vendor: apache
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Severity by source

Vendor (apache) PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SUSE
HIGH
qualitative
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (apache).

CVSS VectorVendor: apache

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

4
Patch released
Apr 11, 2026 - 02:30 nvd
Patch available
EUVD ID Assigned
Apr 09, 2026 - 19:45 euvd
EUVD-2026-21012
Analysis Generated
Apr 09, 2026 - 19:45 vuln.today
CVE Published
Apr 09, 2026 - 19:21 nvd
HIGH 7.5

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 442 maven packages depend on org.apache.tomcat.embed:tomcat-embed-core (33 direct, 409 indirect)
  • 20 maven packages depend on org.apache.tomcat:tomcat-catalina (8 direct, 12 indirect)
  • 9 maven packages depend on org.apache.tomcat:tomcat-tribes (3 direct, 6 indirect)

Ecosystem-wide dependent count for version 9.0.13 and other introduced versions.

DescriptionCVE.org

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.

AnalysisAI

Padding oracle attack in Apache Tomcat EncryptInterceptor leaks encrypted session data confidentiality across versions 7.0.100-7.0.109, 8.5.38-8.5.100, 9.0.13-9.0.115, 10.0.0-M1-10.1.52, and 11.0.0-M1-11.0.18 when default configuration is deployed. Unauthenticated remote attackers exploit oracle responses to decrypt sensitive information without authentication (CVSS:3.1 AV:N/AC:L/PR:N). CWE-209 (information exposure through error messages) enables cryptographic side-channel extraction. No public exploit identified at time of analysis; low observed exploitation activity (EPSS 0.02%).

Technical ContextAI

Padding oracle vulnerability (CWE-209) in EncryptInterceptor default configuration exposes cryptographic implementation flaws. Attackers submit crafted ciphertext blocks and analyze error message timing/content differences to iteratively decrypt CBC-mode encrypted payloads without key possession. Affects cpe:2.3:a:apache_software_foundation:apache_tomcat across five major release branches spanning versions with default encryption settings.

RemediationAI

Vendor-released patch: upgrade to Apache Tomcat 11.0.19, 10.1.53, or 9.0.116 immediately. Apache Foundation confirms patched versions eliminate padding oracle response disclosure in EncryptInterceptor. For Tomcat 7.x and 8.5.x branches reaching end-of-life, migration to supported 9.0.116+ or 10.1.53+ is mandatory-no further 7.x/8.5.x security updates planned. Interim workaround: disable EncryptInterceptor in server.xml cluster configuration if encrypted session replication is non-critical; consult official advisory for alternative encryption configurations. Reference: https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w and https://nvd.nist.gov/vuln/detail/CVE-2026-29146 for vendor guidance.

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Same weakness CWE-209 – Error Message Information Leak

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Vendor StatusVendor

SUSE

Severity: High
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-29146 vulnerability details – vuln.today
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