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Apache Tomcat CVE-2026-74049

| EUVDEUVD-2026-105005 LOW
Execution After Redirect (EAR) (CWE-698)
2026-10-20 apache GHSA-2hg3-hfj5-cq2f
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Identify protected Tomcat endpoint
  2. Exploit
    Send crafted HTTP request
  3. Execution
    Trigger redirect without halt
  4. Impact
    Server leaks protected response data

Vulnerability Assessment

Weakness
CWE
ASVS 5.0
V15 - Secure Coding and Architecture Redirect without exit
Exploitation Conditions

Exploitation requires an application running on an affected Tomcat version (11.0.0-M1 through 11.0.26, 10.1.0-M1 through 10.1.60, 9.0.0.M1 through 9.0.122, or EOL 8.5.0-8.5.100 / 7.0.0-7.0.109) that relies on an HTTP redirect to enforce an access-control or flow-control decision; the Execution After Redirect flaw means request processing continues past the redirect, so the exposure exists wherever application or container code issues a redirect but does not terminate the request. The concrete prerequisite the attacker needs is a reachable endpoint whose security depends on that redirect halting execution. LIMITING FACTORS: the input provides no CVSS vector, so authentication requirements are not confirmed from available data; realistic impact is limited to information disclosure (no integrity or availability impact indicated), and deployments already on the fixed releases (11.0.27 / 10.1.61 / 9.0.123) are not exposed.

Impact

No CVSS vector, EPSS score, or SSVC data was provided for CVE-2026-74049, so quantitative risk signals are entirely absent and must be inferred from the CWE and description. The flaw is an Execution After Redirect (CWE-698) weakness in Apache Tomcat, and the vendor-supplied 'Information Disclosure' tag indicates the practical impact is unauthorized read access to data/resources that should have been gated behind the redirect, rather than code execution or integrity loss. There is no CISA KEV listing and no POC referenced in the input, so exploitation status is 'no public exploit identified at time of analysis' - this is not currently a confirmed active-exploitation priority. That said, EAR bugs in Tomcat are typically network-reachable and often require no authentication, and Tomcat's enormous deployment footprint means a widely-applicable information-disclosure flaw warrants prompt patching even without an EPSS/KEV signal. Net assessment: likely a moderate-severity, low-complexity disclosure issue rather than a critical RCE, but the complete absence of a scored CVSS vector means severity is inferred and should be verified against the Apache advisory. CONFLICT/GAP: CVSS is 'N/A' in the input, so attack vector, complexity, and privilege requirements cannot be confirmed - treat the assessed vector below as analyst-derived, not vendor-confirmed.

Exploit ScenarioDerived

A remote attacker sends a crafted HTTP request to a Tomcat-hosted application endpoint that performs an access-control check and issues a redirect but continues processing the request afterward. Because execution does not halt at the redirect, the server still generates and returns the protected response body or resource data, disclosing information the redirect was meant to withhold. No public exploit code is referenced in the available data, so this scenario is based on the CWE-698 pattern rather than a confirmed POC.

Monitor Track and reassess. Why: LOW severity (CVSS 0.1-3.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 20, 2026

Execution After Redirect in Apache Tomcat 9.0.x, 10.1.x, and 11.0.x lets remote attackers cause request processing to continue after an HTTP redirect, which can bypass redirect-based access or flow controls and lead to limited information disclosure. The issue affects applications running on the listed version ranges, including end-of-life 7.0.x and 8.5.x releases, that depend on a redirect to stop execution rather than explicitly terminating the request. Vendor fixes are available in 11.0.27, 10.1.61, and 9.0.123; available data shows no KEV entry, no public exploit code, and no EPSS score.

RemediationAI

Vendor-released patch: 11.0.27, 10.1.61, and 9.0.123. Upgrade to the release matching the branch in use; users on the EOL 7.0.x or 8.5.x lines must migrate to a supported release because those branches are no longer patched. If immediate upgrade is not possible, review application and container code that issues HTTP redirects for access-control or flow-control decisions and ensure execution terminates explicitly after the redirect (for example, return from the handler or enforce the decision in a filter), then test that legitimate redirect flows still work; this is an application-code compensating control and does not change the fact that the Tomcat instance remains vulnerable. See the vendor advisory at https://lists.apache.org/thread.html/lolc9wo4tzjog2tnwctv93hz9gjcdnc6 for the official fix information.

Affected VersionsENISA

Apache Tomcat 10.1.0-M1 ≤10.1.60
Apache Tomcat 9.0.0.M1 ≤9.0.122
Apache Tomcat 8.5.0 ≤8.5.100
Apache Tomcat 11.0.0-M1 ≤11.0.26
Apache Tomcat 7.0.0 ≤7.0.109

Affected Packages

euvd apache_tomcat no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-698 (Execution After Redirect) is a control-flow flaw in web request handling: an application or container sends an HTTP redirect, but the underlying thread continues executing the handler instead of terminating, so statements after the redirect still run. In Apache Tomcat, deployments that use a redirect as an access-control or flow-control gate are exposed because the redirect is not a reliable request terminator; the assessed impact is confidentiality-only (C:L) with no integrity or availability effect. CPE data identifies the affected package as apache_software_foundation:apache_tomcat, and the flaw applies across the 11.0, 10.1, 9.0, and legacy 8.5/7.0 branches rather than a single connector or protocol implementation. Exploitation depends on the application's own use of redirects, not merely on Tomcat being internet-facing.

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Severity by source

Vendor (apache) PRIMARY LOW
vuln.today AI 5.3 MEDIUM

EAR flaws in Tomcat are remotely reachable with low complexity and typically no auth (AV:N/AC:L/PR:N); impact is limited information disclosure, so C:L and I/A:N.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (apache).

DescriptionCVE.org

Execution After Redirect (EAR) vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.26, from 10.1.0-M1 through 10.1.60, from 9.0.0.M1 through 9.0.122.

The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.27, 10.1.61, 9.0.123, which fixes the issue.

Threat Intelligence Overview

EPSS Score
0.3%
Top 83% exploitable
Prevalence
High
Apache Tomcat is a ubiquitously-deployed Java servlet/JSP server in enterprises
Social Media
1
Sightings
Data Quality
1 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity LOW
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
LOW severity (CVSS 0.1-3.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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