CVE-2026-34486

Apache Tomcat Missing Encryption of Sensitive Data Vulnerability

Actively exploited (CISA KEV) High 7.5 CVSS 3.1

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.

Description as published by the source, in English.

Key facts

Published: 2026-04-09
Last modified: 2026-08-10
Assigned by: security@apache.org
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Scored by: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Probability of exploitation: 42.6 % higher than 99 % of all known vulnerabilities
EPSS, next 30 days, model v2026.06.15
Fix available: Not registered in the sources

Actively exploited

CISA added this vulnerability to the Known Exploited Vulnerabilities catalogue on 2026-08-04, with a remediation deadline of 2026-08-07 for US federal agencies.

Required action: 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.

Affected products

Vendor	Product	Versions	Status
Apache	Tomcat	10.1.53	Affected
Apache	Tomcat	11.0.20	Affected
Apache	Tomcat	9.0.116	Affected
Redhat	Enterprise Linux	10.0	Affected
Redhat	Enterprise Linux	8.0	Affected
Redhat	Enterprise Linux	9.0	Affected
Redhat	Enterprise Linux Els	7.0	Affected
Redhat	Enterprise Linux Eus	10.0	Affected
Redhat	Enterprise Linux Tus	8.8	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	8.8	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	9.2	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	9.4	Affected
Redhat	Enterprise Linux Update Services For Sap Solutions	9.6	Affected
Redhat	Jboss Web Server	7.0.0	Affected

Weakness type

CWE-311: Missing Encryption of Sensitive Data
The product does not encrypt sensitive or critical information before storage or transmission.
CWE-807: Reliance on Untrusted Inputs in a Security Decision
The product uses a protection mechanism that relies on the existence or values of an input, but the input can be modified by an untrusted actor in a way that bypasses the protection mechanism.

Attack techniques

Derived through the weakness type: CVE to CWE to CAPEC to ATT&CK. This shows which techniques the weakness class is historically used for. It does not assert that this vulnerability has been exploited that way.

T1005: Data from Local System collection
T1040: Network Sniffing credential-access, discovery
T1056.004: Credential API Hooking collection, credential-access
T1111: Multi-Factor Authentication Interception credential-access
T1539: Steal Web Session Cookie credential-access
T1552.004: Private Keys credential-access

References

https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly Mailing List, Vendor Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomc… Third Party Advisory
https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tom… Mitigation, Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36787 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36788 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36789 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36790 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36876 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36877 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36878 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:36879 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:37136 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:37137 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:38505 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:39188 Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:39189 Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-34486 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2457027 Issue Tracking, Third Party Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json Third Party Advisory
https://socradar.io/blog/snowlight-government-chinese-campaign/ Third Party Advisory

Does this affect you?

A vulnerability matters only if you run the product, in an affected version, somewhere an attacker can reach.

Check your asset list Browse all vulnerabilities

Sources and freshness

CVE

What it is: A reference number naming one specific vulnerability, for example CVE-2024-9474.
What it tells you: Which vulnerability we are talking about, and in which product.
What it does NOT tell you: Nothing about how serious it is, whether anyone is exploiting it, or whether it concerns you.
Why it matters: Without a shared number, vendor, authority and tooling cannot discuss the same flaw.
Used with the others: The number is the key. NVD, KEV and EPSS all describe the same CVE.

NVD CWE CISA KEV EPSS

How to read this together

No single value should be used on its own. A high CVSS score does not mean a vulnerability is being exploited, and a low one does not mean it is harmless. The four sources answer four different questions.

CVE names the specific vulnerability.
NVD adds severity and technical detail about it.
CWE describes the type of mistake behind it.
CISA KEV shows that it is already being exploited.
EPSS estimates how likely exploitation is soon.

The order that decides what is urgent

Do you actually have the product?
Is the version you run affected?
Is it listed in CISA KEV?
Does it have a high EPSS score?
Is the system reachable from the internet or from others?
How important is the system to the business?
Are there compensating controls already in place?

The first two questions are not about the vulnerability at all. They are about you, and they remove most of the list before you start.

A short example

Fix this week

CVSS 6,5 (medium)

In CISA KEV: yes
EPSS: 94 per cent
A firewall facing the internet

Can be scheduled

CVSS 9,8 (critical)

In CISA KEV: no
EPSS: 0,04 per cent
A test server with no internet access

Sorted by CVSS alone, the one on the right comes first. It is the more serious flaw in theory. But the one on the left is being used against real organisations right now, and it sits where an attacker can reach it. That is the one to fix first.

The critical one still has to be fixed. It just does not have to be fixed today.

This product uses the NVD API but is not endorsed or certified by the NVD. CVE and the CVE logo are registered trademarks of The MITRE Corporation; CVE records are used under the CVE Terms of Use. CWE is a trademark of The MITRE Corporation, used per the CWE Terms of Use. KEV data from CISA (CC0). Exploitation probability from EPSS, a FIRST.org project. Open-source package data from OSV and the GitHub Advisory Database (CC-BY 4.0).

Scores and vectors are shown as published by the sources. The ordering of results is Berigo's own editorial assessment, described on the search page, and is not NVD data. An empty result never means a system is safe.