CVE-2026-41293: Apache Tomcat Apache Tomcat - HTTP/2 Request Vulnerability

CRITICAL
Advisory Identifier: GHSA-r29c-68gh-xp6x
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CVSS 9.8
CWE-20
Published
Advisory Summary

CVE-2026-41293 is a CRITICAL (CVSS 9.8) apache tomcat - http/2 request vulnerability (CWE-20: Improper Input Validation) affecting Apache Tomcat libraries in the Maven ecosystem. The issue involves apache tomcat - http/2 request headers not validated. Remediation is available by upgrading affected packages to version 9.0.118, 10.1.55, 11.0.22.

CVE-2026-41293 at a Glance

CVE Identifier CVE-2026-41293
GHSA Identifier GHSA-r29c-68gh-xp6x
Severity CRITICAL
CVSS v3.1 Base Score 9.8
CWE Classification CWE-20: Improper Input Validation
Affected Product Apache Tomcat
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 9.8

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-41293

To remediate this vulnerability, upgrade all affected Apache Tomcat dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.apache.tomcat.embed:tomcat-embed-core fixed: 9.0.118 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>9.0.118</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 10.1.55 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>10.1.55</version>
</dependency>
org.apache.tomcat.embed:tomcat-embed-core fixed: 11.0.22 
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>11.0.22</version>
</dependency>
org.apache.tomcat:tomcat fixed: 9.0.118 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>9.0.118</version>
</dependency>
org.apache.tomcat:tomcat fixed: 10.1.55 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>10.1.55</version>
</dependency>
org.apache.tomcat:tomcat fixed: 11.0.22 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat</artifactId>
    <version>11.0.22</version>
</dependency>
org.apache.tomcat:tomcat-coyote fixed: 9.0.118 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-coyote</artifactId>
    <version>9.0.118</version>
</dependency>
org.apache.tomcat:tomcat-coyote fixed: 10.1.55 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-coyote</artifactId>
    <version>10.1.55</version>
</dependency>
org.apache.tomcat:tomcat-coyote fixed: 11.0.22 
<dependency>
    <groupId>org.apache.tomcat</groupId>
    <artifactId>tomcat-coyote</artifactId>
    <version>11.0.22</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.apache.tomcat.embed

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-41293, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.apache.tomcat.embed

Analyze the terminal output to locate any version of Apache Tomcat in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 9.0.118), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.apache.tomcat.embed command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-20: Improper Input Validation, where the product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. In Apache Tomcat, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Versions Affected: Apache Tomcat 11.0.0-M1 to 11.0.21 Apache Tomcat 10.1.0-M1 to 10.1.54 Apache Tomcat 9.0.0.M1 to 9.0.117 Older, unsupported versions may also be affected Description: HTTP/2 request headers were not validated which may have triggered unexpected application behaviour if the application (quite reasonably) assumed that header value exposed through the Servlet API would be specification compliant. Mitigation: Users of the affected versions should apply one of the following mitigations: - Upgrade to Apache Tomcat 11.0.22 or later - Upgrade to Apache Tomcat 10.1.55 or later - Upgrade to Apache Tomcat 9.0.118 or later Credit: This issue was identified by Dawit Jeong (@dawitngoliath)

CVE-2026-41293 Affected Apache Tomcat Versions

9 component(s)
Fixed Versions:
9.0.11810.1.5511.0.22
Product / Package Ecosystem Affected Versions Fixed Version
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 8.5.0
< 9.0.118
9.0.118
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 10.1.0-M1
< 10.1.55
10.1.55
org.apache.tomcat.embed:tomcat-embed-core
maven/org.apache.tomcat.embed/tomcat-embed-core
Maven
≥ 11.0.0-M1
< 11.0.22
11.0.22
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 8.5.0
< 9.0.118
9.0.118
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 10.1.0-M1
< 10.1.55
10.1.55
org.apache.tomcat:tomcat
maven/org.apache.tomcat/tomcat
Maven
≥ 11.0.0-M1
< 11.0.22
11.0.22
org.apache.tomcat:tomcat-coyote
maven/org.apache.tomcat/tomcat-coyote
Maven
≥ 8.5.0
< 9.0.118
9.0.118
org.apache.tomcat:tomcat-coyote
maven/org.apache.tomcat/tomcat-coyote
Maven
≥ 10.1.0-M1
< 10.1.55
10.1.55
org.apache.tomcat:tomcat-coyote
maven/org.apache.tomcat/tomcat-coyote
Maven
≥ 11.0.0-M1
< 11.0.22
11.0.22

References

NVD — CVE-2026-41293 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-41293
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/2a2476460e823789f530a22207873ea8cd6eff3b
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/3915fd27e6810b14ccd21e3d900bd8faef44d3df
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/57c2b3bfd62792631e1df24cf4237b990a0b36fa
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/c2925554c677da57390f940d856871e18daaacab
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/cf9452443bcbf3b1a4b435ef7d624364f1b65ca3
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/e5cef9618c3f4fd31bd6fb1e83f0f18022280dac
Security Fix Commit FIX COMMIT
https://github.com/apache/tomcat/commit/f72a6174ab1f0f5a053435f80448b4f6837fe6d7
Apache Tomcat Source Repository REPOSITORY
https://github.com/apache/tomcat
lists.apache.org/thread/qwg0q16z7xkb... WEB
https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-10.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-11.html
Apache Tomcat Security Information SECURITY
https://tomcat.apache.org/security-9.html
Apache Tomcat Security Information SECURITY
http://www.openwall.com/lists/oss-security/2026/05/12/13

Frequently Asked Questions

What is CVE-2026-41293?
CVE-2026-41293 is a security vulnerability in Apache Tomcat involving Apache Tomcat - HTTP/2 request headers not validated under CWE-20: Improper Input Validation.
Which Apache Tomcat versions are affected?
Affected versions include releases prior to 9.0.118, 10.1.55, 11.0.22 across affected packages: org.apache.tomcat.embed:tomcat-embed-core, org.apache.tomcat:tomcat, org.apache.tomcat:tomcat-coyote.
What version fixes CVE-2026-41293?
Upgrading to 9.0.118, 10.1.55, 11.0.22 (or the latest patched release for your respective branch) resolves the vulnerability.
Is tomcat-embed-core affected?
Yes, org.apache.tomcat.embed:tomcat-embed-core is affected in releases prior to 9.0.118, 10.1.55, 11.0.22. Upgrade your dependency to 9.0.118, 10.1.55, 11.0.22 or later.
Is tomcat affected?
Yes, org.apache.tomcat:tomcat is affected in releases prior to 9.0.118, 10.1.55, 11.0.22. Upgrade your dependency to 9.0.118, 10.1.55, 11.0.22 or later.
What is the CVSS score of CVE-2026-41293?
CVE-2026-41293 has a CVSS v3.1 base score of 9.8 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-41293?
CVE-2026-41293 is classified under CWE-20: Improper Input Validation (The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.).
How can I check Maven dependencies for CVE-2026-41293?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.apache.tomcat.embed'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-r29c-68gh-xp6x",
  "modified" : "2026-08-31T21:04:40Z",
  "published" : "2026-05-12T18:30:38Z",
  "aliases" : [ "CVE-2026-41293" ],
  "summary" : "Apache Tomcat - HTTP/2 request headers not validated",
  "details" : "Versions Affected:\nApache Tomcat 11.0.0-M1 to 11.0.21\nApache Tomcat 10.1.0-M1 to 10.1.54\nApache Tomcat 9.0.0.M1 to 9.0.117\nOlder, unsupported versions may also be affected\n\nDescription:\nHTTP/2 request headers were not validated which may have triggered\nunexpected application behaviour if the application (quite reasonably)\nassumed that header value exposed through the Servlet API would be\nspecification compliant.\n\nMitigation:\nUsers of the affected versions should apply one of the following\nmitigations:\n- Upgrade to Apache Tomcat 11.0.22 or later\n- Upgrade to Apache Tomcat 10.1.55 or later\n- Upgrade to Apache Tomcat 9.0.118 or later\n\nCredit:\nThis issue was identified by Dawit Jeong (@dawitngoliath)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
  } ],
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    },
    "ranges" : [ {
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      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.apache.tomcat:tomcat-coyote"
    },
    "ranges" : [ {
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  }, {
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  } ],
  "references" : [ {
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  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/19f17a257797e8d139b33ff9c88d362a273be148"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/apache/tomcat/commit/1c70480466572c9192ed412ebefcd43fc63137fd"
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  }, {
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  }, {
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    "url" : "https://lists.apache.org/thread/qwg0q16z7xkb2qrr853wdll5531mvl1r"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-10.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-11.html"
  }, {
    "type" : "WEB",
    "url" : "https://tomcat.apache.org/security-9.html"
  }, {
    "type" : "WEB",
    "url" : "http://www.openwall.com/lists/oss-security/2026/05/12/13"
  } ],
  "database_specific" : {
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    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-18T20:28:53Z",
    "nvd_published_at" : "2026-05-12T16:16:17Z"
  }
}