Bug 2373845 (CVE-2025-49763)

Summary: CVE-2025-49763 trafficserver: Traffic Server ESI Inclusion Depth Vulnerability
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in trafficserver. The Edge Side Includes (ESI) plugin lacks a limit on maximum inclusion depth, allowing a remote attacker to trigger excessive memory consumption by inserting malicious instructions. This condition occurs due to the plugin's inability to restrict the nesting of ESI includes, potentially leading to a denial of service. The vulnerability is triggered via a crafted ESI request.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2373881, 2373882, 2373883, 2373884    
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Description OSIDB Bzimport 2025-06-19 11:01:12 UTC 
ESI plugin does not have the limit for maximum inclusion depth, and that allows excessive memory consumption if malicious instructions are inserted.

Users can use a new setting for the plugin (--max-inclusion-depth) to limit it.
This issue affects Apache Traffic Server: from 10.0.0 through 10.0.5, from 9.0.0 through 9.2.10.

Users are recommended to upgrade to version 9.2.11 or 10.0.6,  which fixes the issue.