Bug 2558492 (CVE-2026-111805)

Summary: CVE-2026-111805 trafficserver: Apache Traffic Server: Denial of Service via truncated HTTP/2 Content-Length header
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Apache Traffic Server. A remote attacker can exploit this vulnerability by sending an HTTP/2 request containing a truncated Content-Length header. This causes Apache Traffic Server to exhaust the worker connection pool of upstream HTTP/1.1 origin servers, resulting in a Denial of Service (DoS).
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Bug Depends On: 2562343, 2562347    
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Description OSIDB Bzimport 2026-10-21 19:22:11 UTC 
Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a truncated HTTP/2 Content-Length value.



This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.



Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.