Bug 2558493 (CVE-2026-111810)

Summary: CVE-2026-111810 trafficserver: trafficserver: Denial of Service via unthrottled logging of stripped headers
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. When processing incoming requests, the server writes an unthrottled diagnostic log entry for each internal header that it strips. A remote attacker can exploit this issue by sending HTTP requests with an unusually high number of internal headers, causing excessive log data generation that may exhaust disk space and result in a Denial of Service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2562348, 2562350    
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Description OSIDB Bzimport 2026-10-21 19:22:21 UTC 
Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains.



This issue affects Apache Traffic Server: 9.2.15, 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.