Bug 2562010

Summary: CVE-2026-115893 tree-sitter0.25: Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction [fedora-all]
Product: [Fedora] Fedora Reporter: Ronit Dey <rdey>
Component: tree-sitter0.25Assignee: Peter Oliver <mavit>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: asn, mavit
Target Milestone: ---Keywords: Security, SecurityTracking
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Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8ba551f9-13aa-4207-9e11-d4886fcc0a9a"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On:    
Bug Blocks: 2560222    

Description Ronit Dey 2026-10-27 14:29:24 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

Wasmtime is a runtime for WebAssembly. Prior to 36.0.19, 48.0.7, and 49.0.4, the Cranelift compiler backend on aarch64 can compile a Wasm br_table instruction with more than approximately 256,000 targets so that it has an incorrect conditional branch target. The branch can then jump to arbitrary other code at a user-controlled offset, allowing a user-controlled Wasm module to escape the sandbox on aarch64 engines using the default Cranelift backend. This issue is fixed in versions 36.0.19, 48.0.7, and 49.0.4.