CVE-2026-34486
Apache Tomcat Missing Encryption of Sensitive Data Vulnerability
Exploited in the wild
This vulnerability is on the CISA Known Exploited Vulnerabilities list, added 2026-08-04. Federal due date: 2026-08-07.
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.
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| maven | org.apache.tomcat:tomcat | = 11.0.20 | 11.0.21 |
| maven | org.apache.tomcat:tomcat-tribes | = 11.0.20 | 11.0.21 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Apache | Tomcat | Versions 9.0.116, 10.1.53, 11.0.20 |
| Redhat | Jboss Web Server | Version 7.0.0 |
| Redhat | Enterprise Linux | Versions 8.0, 9.0, 10.0 |
| Redhat | Enterprise Linux Els | Version 7.0 |
| Redhat | Enterprise Linux Eus | Version 10.0 |
| Redhat | Enterprise Linux Tus | Version 8.8 |
| Redhat | Enterprise Linux Update Services For Sap Solutions | Versions 8.8, 9.2, 9.4, 9.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- CISA KEV catalog
- https://lists.apache.org/thread/9510k5p5zdvt9pkkgtyp85mvwxo2qrly
- https://www.vicarius.io/vsociety/posts/cve-2026-34486-detection-script-rce-on-apache-tomcat
- https://www.vicarius.io/vsociety/posts/cve-2026-34486-mitigation-script-rce-on-apache-tomcat
- https://access.redhat.com/errata/RHSA-2026:36787
- https://access.redhat.com/errata/RHSA-2026:36788
- https://access.redhat.com/errata/RHSA-2026:36789
- https://access.redhat.com/errata/RHSA-2026:36790
- https://access.redhat.com/errata/RHSA-2026:36876
- https://access.redhat.com/errata/RHSA-2026:36877
- https://access.redhat.com/errata/RHSA-2026:36878
- https://access.redhat.com/errata/RHSA-2026:36879
- https://access.redhat.com/errata/RHSA-2026:37136
- https://access.redhat.com/errata/RHSA-2026:37137
- https://access.redhat.com/errata/RHSA-2026:38505
- https://access.redhat.com/errata/RHSA-2026:39188
- https://access.redhat.com/errata/RHSA-2026:39189
- https://access.redhat.com/security/cve/CVE-2026-34486
- https://bugzilla.redhat.com/show_bug.cgi?id=2457027
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34486.json
- https://socradar.io/blog/snowlight-government-chinese-campaign/
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-34486
- https://github.com/advisories/GHSA-69r9-qgr7-g2wj
- https://nvd.nist.gov/vuln/detail/CVE-2026-34486
- https://github.com/apache/tomcat/commit/1fab40ccc752e22639eccfe290d5624afad7eccd
- https://github.com/apache/tomcat/commit/55f3eb9148233054fccfdf761141c6894a050be1