Bug 2563536 (CVE-2026-119139)

Summary: CVE-2026-119139 wasmtime: wasmtime: Denial of Service via unhandled assertion in component function call
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: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Wasmtime. An attacker who supplies a crafted WebAssembly component can cause a Denial of Service (DoS) by crashing the host application. This issue occurs because an internal assertion fails when the host invokes an exported guest function configured with asynchronous Application Binary Interface (ABI) options.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-29 17:35:08 UTC
Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a leftover assertion in component::Func::call that rejects guest exports using the async ABI option. An attacker who supplies a component with an async-lifted export can crash the host process when an embedder invokes that export through Func::call.