Bug 2558477 (CVE-2026-111804)

Summary: CVE-2026-111804 trafficserver: trafficserver: Denial of Service via use-after-free in WASM plugin
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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's experimental WebAssembly (WASM) plugin. A remote attacker can trigger a use-after-free condition during transaction closure or supply unvalidated metric identifiers to the internal statistics interface. This flaw allows an attacker to cause an application crash, resulting in a Denial of Service (DoS), or potentially corrupt internal application metrics.
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Bug Depends On: 2562341, 2562342    
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Description OSIDB Bzimport 2026-10-21 18:42:25 UTC 
Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API.



This issue affects Apache Traffic Server: from 10.0.0 through 10.1.4, 10.2.0.



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