# CVE-2026-29146 — Apache Tomcat > As of 2026-08-17, CVE-2026-29146 is a HIGH-severity vulnerability in Apache Tomcat, CVSS v3.1 7.5, EPSS 2.8% (86.4th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-29146, most recently “CVE-2026-34486: Apache Tomcat EncryptInterceptor Bypass Actively Exploited in SnowLight and AI-Assisted Campaigns”. **Last updated:** 2026-08-17 ## What is CVE-2026-29146? 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. The record classifies CVE-2026-29146 under weakness classes [CWE-209](https://intel.threadlinqs.com/cwe/CWE-209), [CWE-642](https://cwe.mitre.org/data/definitions/642.html), [CWE-1240](https://cwe.mitre.org/data/definitions/1240.html). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 184 days ago. ## Severity and exploitation probability - **CVSS v3.1 base score:** 7.5 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`) - **EPSS (FIRST):** 2.8% probability of exploitation in the next 30 days, higher than 86.4% of all scored CVEs - **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog - **Threadlinqs priority:** 7.2/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability - **Published:** 2026-04-09, last modified 2026-08-17 ## Is CVE-2026-29146 being exploited? It currently carries a trending score of 27 in the Threadlinqs vulnerability feed. ## Affected products and versions - [Apache Software Foundation](https://intel.threadlinqs.com/vendors/apache-software-foundation): Apache Tomcat Affected software packages: - `maven:org.apache.tomcat:tomcat` — patched in 9.0.116 - `maven:org.apache.tomcat:tomcat` — patched in 10.1.53 - `maven:org.apache.tomcat:tomcat-tribes` — patched in 9.0.116 - `maven:org.apache.tomcat:tomcat-tribes` — patched in 10.1.53 - `maven:org.apache.tomcat:tomcat-tribes` — patched in 11.0.20 - `maven:org.apache.tomcat:tomcat` — patched in 11.0.20 - `maven:org.apache.tomcat:tomcat-tribes` - `maven:org.apache.tomcat:tomcat` - `maven:org.apache.tomcat:tomcat-tribes` - `maven:org.apache.tomcat:tomcat` ## How to fix CVE-2026-29146 Fixed versions are recorded for 6 packages: maven:org.apache.tomcat:tomcat 9.0.116, maven:org.apache.tomcat:tomcat 10.1.53, maven:org.apache.tomcat:tomcat-tribes 9.0.116, maven:org.apache.tomcat:tomcat-tribes 10.1.53, maven:org.apache.tomcat:tomcat-tribes 11.0.20, maven:org.apache.tomcat:tomcat 11.0.20. Vendor advisory: [https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w](https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory. ## Threat activity tracking CVE-2026-29146 1 tracked threat in the Threadlinqs corpus references CVE-2026-29146, either in the campaign’s CVE list or as an indicator on the campaign record. - [CVE-2026-34486: Apache Tomcat EncryptInterceptor Bypass Actively Exploited in SnowLight and AI-Assisted Campaigns](https://intel.threadlinqs.com/threat/TL-2026-1885) — HIGH · 2026-08-05 ## Sources Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD. **Vendor advisory and patch** - [lists.apache.org — vendor advisory](https://lists.apache.org/thread/lzt04z2pb3dc5tk85obn80xygw3z1p0w) Canonical: https://intel.threadlinqs.com/cve/CVE-2026-29146 Full detection coverage and IOCs for threats exploiting CVE-2026-29146 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp