# CVE-2026-65182 — Apache Tomcat

> As of 2026-08-26, CVE-2026-65182 is a CRITICAL-severity vulnerability in Apache Tomcat, CVSS v3.1 9.1, EPSS 0.4% (38.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-65182, most recently “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”.

**Last updated:** 2026-08-26

## What is CVE-2026-65182?

Improper Access Control, Incorrect Authorization vulnerability in Apache Tomcat leads to security constraint bypass if a constraint for a longer path is specified before a more restrictive constraint for a shorter sub-path. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Users are recommended to upgrade to version 11.0.25, 10.1.58, 9.0.121, which fixes the issue.

The record classifies CVE-2026-65182 under weakness classes [CWE-284](https://cwe.mitre.org/data/definitions/284.html), [CWE-863](https://cwe.mitre.org/data/definitions/863.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, integrity. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 19 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 9.1 — CRITICAL (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **EPSS (FIRST):** 0.4% probability of exploitation in the next 30 days, higher than 38.1% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 6.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-25, last modified 2026-08-26

## Is CVE-2026-65182 being exploited?

No public exploitation evidence for CVE-2026-65182 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-08-26. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- **Apache Software Foundation**: Apache Tomcat

## How to fix CVE-2026-65182

Vendor advisory: [https://lists.apache.org/thread/joosxvzc9b49ttj8lj0jw9mqt0ml767m](https://lists.apache.org/thread/joosxvzc9b49ttj8lj0jw9mqt0ml767m). 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-2026-65182

1 tracked threat in the Threadlinqs corpus references CVE-2026-65182, either in the campaign’s CVE list or as an indicator on the campaign record.

- [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, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-08-27. 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/joosxvzc9b49ttj8lj0jw9mqt0ml767m)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-65182
Full detection coverage and IOCs for threats exploiting CVE-2026-65182 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp