RHSA-2026:68257
Vulnerability from csaf_redhat - Published: 2026-09-16 15:12 - Updated: 2026-09-25 22:28In 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.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-0:10.1.60-0.1.hum1@src | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
|
| Unresolved product id: Red Hat Hardened Images:tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
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| Unresolved product id: Red Hat Hardened Images:tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms | — |
Vendor Fix
fix
|
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| Unresolved product id: Red Hat Hardened Images:tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms | — |
Vendor Fix
fix
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A flaw was found in Apache Tomcat. This improper authentication vulnerability allows a remote attacker to be authenticated even if their user account does not exist in the DataSourceRealm, under specific circumstances such as CLIENT-CERT or SPNEGO authentication. This can lead to unauthorized access to the system.
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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.",
"title": "CVSS score applicability"
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},
{
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"cwe": {
"id": "CWE-305",
"name": "Authentication Bypass by Primary Weakness"
},
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"ids": [
{
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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "tomcat: Apache Tomcat: Improper Authentication due to principal lookup failure",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important vulnerability in Apache Tomcat allows unauthorized access when configured with CLIENT-CERT or SPNEGO authentication alongside a DataSourceRealm. This flaw could permit a user to be authenticated even if their account does not exist, bypassing intended security controls in Red Hat deployments where these specific configurations are in use.",
"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.",
"title": "CVSS score applicability"
}
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{
"category": "external",
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{
"category": "external",
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},
{
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"release_date": "2026-08-25T21:59:17.438000+00:00",
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{
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"date": "2026-09-16T15:12:00+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
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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.
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.
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.