CyberSecBulletin
CVE-2026-29146NVD status: Modified

Apache Tomcat: Generation of Error Message Containing Sensitive Information

Published Updated By the CyberSecBulletin desk

CVE-2026-29146 is a high-severity generation of error message containing sensitive information vulnerability in Apache Tomcat from Apache, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. Affected Apache Tomcat versions: 11.0.0-M1 through 11.0.18; 10.0.0-M1 through 10.1.52; 9.0.13 through 9.0.115, and others listed below. The record does not name a fixed version, so check the vendor advisory. There is no confirmed exploitation so far. EPSS estimates a 8.85% chance of exploitation within 30 days, which is in the top 4.72% of all scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Tomcat to 9.0.116 or 10.1.53 or 11.0.20, whichever matches your release line, or a later version.
  2. Read the advisory on lists.apache.org for workarounds and exact fixed builds.
  3. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
ApacheApache Tomcat11.0.0-M1 through 11.0.18; 10.0.0-M1 through 10.1.52; 9.0.13 through 9.0.115; 8.5.38 through 8.5.100; 7.0.100 through 7.0.109Not stated
Red HatRed Hat Enterprise Linux 10Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 10.0 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle SupportNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update ServiceNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP SolutionsNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP SolutionsNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP SolutionsNot specified in the recordNot stated
Red HatRed Hat Enterprise Linux 9.6 Extended Update SupportNot specified in the recordNot stated
Red HatRed Hat JBoss Web Server 6.2.3Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 6.2 on RHEL 10Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 6.2 on RHEL 8Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 6.2 on RHEL 9Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 7.0.0Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 7.0 on RHEL 10Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 7.0 on RHEL 8Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 7.0 on RHEL 9Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 6Not specified in the recordNot stated
Red HatRed Hat JBoss Web Server 5Not specified in the recordNot stated
ApacheTomcat7.0.100 through 7.0.109; 8.5.38 through 8.5.100; 9.0.13 up to, but not including, 9.0.116; 10.0.0 up to, but not including, 10.1.53; 11.0.0 up to, but not including, 11.0.209.0.116, 10.1.53, 11.0.20

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. Scored by CNA.

Scoring systemScoreSeverityScored by
CVSS 3.17.5HighCISA (ADP)
CVSS 3.17.5HighCNA

Official description

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.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Generation of Error Message Containing Sensitive Information

The product generates an error message that includes sensitive information about its environment, users, or associated data.

How developers prevent this class of flaw

  • Handle exceptions internally and do not display errors containing potentially sensitive information to a user.
  • Use naming conventions and strong types to make it easier to spot when sensitive data is being used. When creating structures, objects, or other complex entities, separate the sensitive and non-sensitive data as much as possible.
  • Debugging information should not make its way into a production release.

More Generation of Error Message Containing Sensitive Information vulnerabilities (CWE-209)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in Apache Tomcat

All Apache Tomcat vulnerabilities

Recent Generation of Error Message Containing Sensitive Information vulnerabilities

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