# CVE-2026-32990 — Apache Tomcat

> As of 2026-04-10, CVE-2026-32990 is a MEDIUM-severity vulnerability in Apache Tomcat, CVSS v3.1 5.3, EPSS 0.5% (44.7th percentile). Threadlinqs Intelligence links 2 tracked threat campaigns to CVE-2026-32990, most recently “Atlassian October 2026 Security Bulletin: 176 Flaw Entries in Jira and Confluence (incl. CVE-2026-65637, CVE-2026-58062, CVE-2026-75595) and Actively Exploited CVE-2026-21589”.

**Last updated:** 2026-04-10

## What is CVE-2026-32990?

Improper Input Validation vulnerability in Apache Tomcat due to an incomplete fix of CVE-2025-66614. This issue affects Apache Tomcat: from 11.0.15 through 11.0.19, from 10.1.50 through 10.1.52, from 9.0.113 through 9.0.115. Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.

The record classifies CVE-2026-32990 under weakness class [CWE-20](https://intel.threadlinqs.com/cwe/CWE-20). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 197 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 5.3 — MEDIUM (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **EPSS (FIRST):** 0.5% probability of exploitation in the next 30 days, higher than 44.7% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.4/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-04-09, last modified 2026-04-10

## Is CVE-2026-32990 being exploited?

It currently carries a trending score of 21 in the Threadlinqs vulnerability feed.

## Affected products and versions

- [Apache Software Foundation](https://intel.threadlinqs.com/vendors/apache-software-foundation): Apache Tomcat

## How to fix CVE-2026-32990

No vendor patch reference has been recorded for CVE-2026-32990 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-32990

2 tracked threats in the Threadlinqs corpus reference CVE-2026-32990, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Atlassian October 2026 Security Bulletin: 176 Flaw Entries in Jira and Confluence (incl. CVE-2026-65637, CVE-2026-58062, CVE-2026-75595) and Actively Exploited CVE-2026-21589](https://intel.threadlinqs.com/threat/TL-2026-4216) — CRITICAL · 2026-10-23
- [Apache Tomcat 11.0.25 Fixes 11 Vulnerabilities Including HTTP/2 DoS, Authorization Bypass, and Auth Fail-Open Flaws — NVD Scores 5 of 11 CRITICAL/HIGH Despite Apache's Low/Moderate Ratings](https://intel.threadlinqs.com/threat/TL-2026-2159) — CRITICAL · 2026-08-26

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-10-10.

**Vendor advisory and patch**

- [lists.apache.org — vendor advisory](https://lists.apache.org/thread/1nl9zqft0ksqlhlkd3j4obyjz1ghoyn7)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-32990
Full detection coverage and IOCs for threats exploiting CVE-2026-32990 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp