CVE-2026-34486

Apache Tomcat: Missing Encryption of Sensitive Data

As of , CVE-2026-34486 in Apache Tomcat is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 4 August 2026
US federal deadline
7 August 20263 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.07Higher than 93% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: lists.apache.orgLinks below, from CISA's entry.

What CISA says to do

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

CISA's required action

What the flaw is

Apache Tomcat contains a missing encryption of sensitive data vulnerability that allows the bypass of the EncryptInterceptor. This vulnerability can be chained with CVE‐2025‐24813.

CISA's description

Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the EncryptInterceptor. This issue affects Apache Tomcat: 11.0.20, 10.1.53, 9.0.116. Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.

The CVE record's description, from apache

CVE published
9 April 2026
Assigned by
apache
CVSS
7.5 High (CVSS 3.1, from CISA-ADP)
CWE-311
Missing Encryption of Sensitive Data
CISA SSVC, exploitation
active
CISA SSVC, automatable
yes
CISA SSVC, technical impact
partial

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. CISA changed its entry. Edited: description.
  4. The US federal deadline to fix it.

Tomcat: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2017-12617Remote Code ExecutionApache TomcatPatch this weekMetasploit module; EPSS 0.99; verified Exploit-DB entry0.99
CVE-2020-1938Improper Privilege ManagementApache TomcatPatch this weekMetasploit module; EPSS 0.99; verified Exploit-DB entry0.99
CVE-2025-24813Path EquivalenceApache TomcatPatch this weekMetasploit module; EPSS 0.990.99
CVE-2016-8735Remote Code ExecutionApache TomcatPatch this weekEPSS 0.900.90
CVE-2017-12615on Windows Remote Code ExecutionApache TomcatPatch this weekRansomware use; EPSS 0.990.99

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