Apache Tomcat: HTTP/2 request/response mix-up after error during async processing

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-101356
StatePUBLISHED
Assignerapache
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-20 14:16:55 UTC
Updated2026-10-20 19:35:38 UTC
DescriptionIncorrect object recycling and re-use vulnerability in Apache Tomcat affecting HTTP/2 processing of asynchronous servlets can trigger request and/or response mix-up between users. This issue affects Apache Tomcat: from 11.0.22 through 11.0.26, from 10.1.55 through 10.1.60, from 9.0.118 through 9.0.122. Users are recommended to upgrade to version 11.0.27, 10.1.61 or 9.0.123, which fixes the issue.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Problem Types: CWE-362 | Incorrect object recycling and re-use | CWE-362 CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Apache Software Foundation Apache Tomcat affected 11.0.22 11.0.26 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 10.1.55 10.1.60 semver Not specified
CNA Apache Software Foundation Apache Tomcat affected 9.0.118 9.0.122 semver Not specified

References

ReferenceSourceLinkTags
lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27 [email protected] lists.apache.org
www.openwall.com/lists/oss-security/2026/10/20/27 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
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