Bug 2556195 (CVE-2026-103119)

Summary: CVE-2026-103119 tomcat: Apache Tomcat: Information disclosure via buffer under-read during non-blocking writes
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedKeywords: Security
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in Apache Tomcat. During large non-blocking write operations, a buffer under-read can cause an HTTP response body to be split between the current request and the subsequent request handled on the same connection. A remote user sending a follow-up request could receive sensitive data intended for the prior response, leading to information disclosure. This issue can also cause the subsequent request to fail, resulting in a denial of service (DoS).
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-20 14:02:49 UTC 
Buffer under-read vulnerability in Apache Tomcat meant that a large non-blocking write could result in the response body being split between the current request and the next request received on that connection leading most likely to failure of the second request and possibly leakage of data from the first response to the second.



This issue affects Apache Tomcat: from 11.0.0-M25 through 11.0.26.



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