RHSA-2026:68651
Vulnerability from csaf_opensuse - Published: 2026-09-18 10:11 - Updated: 2026-09-29 11:28Summary
Red Hat Security Advisory: tomcat9 security update
Severity
Moderate
Notes
Topic: An update for tomcat9 is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.
Security Fix(es):
* Apache Tomcat: Apache Tomcat: Improper Input Validation vulnerability due to incomplete fix (CVE-2026-32990)
* tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication (CVE-2026-43512)
* tomcat-coyote: Apache Tomcat: HTTP/2 request headers not validated (CVE-2026-41293)
* tomcat-coyote: Apache Tomcat: Information disclosure due to HTTP Authentication Header exposure during WebSocket authentication. (CVE-2026-42498)
* tomcat-coyote: tomcat: Improper Authorization allows security bypass (CVE-2026-43515)
* tomcat-catalina: Apache Tomcat: Improper Handling of Case Sensitivity in LockOutRealm (CVE-2026-43513)
* tomcat: Apache Tomcat: Security constraint bypass via improper URL encoding in rewrite valve (CVE-2026-59083)
* tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations (CVE-2026-59084)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in Apache Tomcat. This improper input validation vulnerability stems from an incomplete fix for a previous security issue (CVE-2025-66614). This flaw may allow an attacker to bypass security controls or cause unexpected behavior within the application.
7.3 (High)
Affected products
Fixed
9 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-admin-webapps-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-docs-webapp-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-el-3.0-api-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-jsp-2.3-api-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-lib-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-servlet-4.0-api-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:tomcat9-webapps-1:9.0.120-1.el10_2.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
In Apache Tomcat, no limit was enforced on the request body for WebDAV LOCK or PROPFIND requests which were available to unauthenticated users. This allows a remote attacker to consume excessive resources, leading to Denial of Service (DoS), making the affected system unavailable to legitimate users.
7.5 (High)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Important
Apache Tomcat did not validate HTTP/2 request headers, triggering unexpected application behavior, as applications may presume that header values exposed through the Servlet API would be valid.
7.3 (High)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. During WebSocket authentication, the HTTP Authentication Header can be exposed to unexpected hosts. This vulnerability leads to information disclosure, potentially allowing an attacker to gain access to sensitive authentication credentials.
6.5 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. When DIGEST authentication was configured, any user not known to the configured Realm would be authenticated if they presented the password "null". This allows a remote attacker to bypass security controls.
6.5 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
In Apache Tomcat, LockOutRealm mishandled case sensitivity in usernames, resulting in less effective blocking of brute force attacks.
5.3 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. The AJP secret was comparable in non-constant time, allowing an attacker on the local network to mount a timing attack to determine the AJP secret, which may lead to unauthorized access or other security bypasses.
CWE-208 - Observable Timing DiscrepancyAffected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Low
In Apache Tomcat, when multiple security constraints defined an HTTP method constraint for the same extension pattern, only the first method constraint was applied. A remote attacker could exploit this to bypass intended security restrictions for information or actions within the application.
5.4 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. This vulnerability, known as Cross-Site Scripting (XSS), allows a remote attacker to inject malicious scripts into the 'number guess example' web page. When other users view the compromised page, these scripts can execute in their web browsers. This could lead to unauthorized access to sensitive information or allow an attacker to alter the content of the website.
5.4 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat's rewrite valve. This vulnerability involves an incorrect control flow implementation where, during the processing of rewrite rules, if the first condition in an OR chain matched, subsequent non-OR conditions were unexpectedly skipped. This can lead to unintended rule processing, potentially allowing for security bypasses or unauthorized access due to misapplied configurations.
6.5 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. When configuring Certificate Revocation Lists (CRLs) for a FFM (presumably a specific type of connector), the system fails to detect and act upon an error condition. This oversight could lead to unexpected behavior or a security bypass, as the intended security controls might not be properly enforced.
CWE-390 - Detection of Error Condition Without ActionAffected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Low
A flaw was found in Apache Tomcat. Due to an always-incorrect control flow implementation, special roles and empty authorization constraints were not accurately included when the effective web.xml configuration was logged. This could lead to a security oversight where administrators might misinterpret the actual authorization constraints, potentially impacting the security posture of the application.
CWE-778 - Insufficient LoggingAffected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Low
A flaw was found in Apache Tomcat. An improper authentication vulnerability in the EncryptionInterceptor component allows a remote attacker to perform a replay attack. This could lead to unauthorized access or manipulation of data within the cluster component.
4.2 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat where access control rules for the default servlet are improperly handled. An attacker can exploit this issue to bypass specific HTTP method restrictions, potentially gaining unauthorized access to protected application resources.
6.5 (Medium)
Affected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Moderate
A flaw was found in Apache Tomcat. This vulnerability, located in the rewrite valve, is due to improper handling of URL encoding (hex encoding). A remote attacker could exploit this to bypass security constraints in certain configurations, potentially gaining unauthorized access or performing actions that should be restricted.
CWE-807 - Reliance on Untrusted Inputs in a Security DecisionAffected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Low
A flaw was found in Apache Tomcat. Insufficient technical documentation regarding the secure configuration of the EncryptInterceptor component may lead to deployments with insecure settings. This vulnerability could allow an attacker to exploit misconfigurations that arise from unclear guidance, potentially compromising the confidentiality or integrity of data processed by the affected system.
CWE-1188 - Initialization of a Resource with an Insecure DefaultAffected products
Fixed
9 products, the same list as for
CVE-2026-32990
Threats
Impact
Low
References
91 references
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"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"title": "tomcat-coyote: Apache Tomcat: Authentication bypass via digest authentication"
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"ids": [
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{
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"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"AppStream-10.2.Z:tomcat9-servlet-4.0-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-webapps-1:9.0.120-1.el10_2.noarch"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:68651"
},
{
"category": "workaround",
"details": "To mitigate this issue, ensure that the EncryptInterceptor in Apache Tomcat is configured according to secure best practices. Review existing configurations of EncryptInterceptor to verify that all security requirements are met and that no insecure settings are in place. If the EncryptInterceptor is not actively used, no specific action is required.",
"product_ids": [
"AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.src",
"AppStream-10.2.Z:tomcat9-admin-webapps-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-docs-webapp-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-el-3.0-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-jsp-2.3-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-lib-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-servlet-4.0-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-webapps-1:9.0.120-1.el10_2.noarch"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 3.8,
"baseSeverity": "LOW",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "HIGH",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
"AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-1:9.0.120-1.el10_2.src",
"AppStream-10.2.Z:tomcat9-admin-webapps-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-docs-webapp-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-el-3.0-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-jsp-2.3-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-lib-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-servlet-4.0-api-1:9.0.120-1.el10_2.noarch",
"AppStream-10.2.Z:tomcat9-webapps-1:9.0.120-1.el10_2.noarch"
]
}
],
"threats": [
{
"category": "impact",
"details": "Low"
}
],
"title": "tomcat: Apache Tomcat: Insufficient documentation for EncryptInterceptor may lead to insecure configurations"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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