Wasmtime: Cranelift backend on aarch64 can jump to incorrect target on large Wasm `br_table` instruction

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115893
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 22:16:58 UTC
Updated2026-10-23 22:16:58 UTC
DescriptionWasmtime 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.

Risk And Classification

Primary CVSS: v3.1 9.9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Problem Types: CWE-691 | CWE-691 CWE-691: Insufficient Control Flow Management

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
3.1CNADECLARED9.9CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Bytecodealliance Wasmtime affected < 36.0.19 Not specified
CNA Bytecodealliance Wasmtime affected >= 37.0.0, < 48.0.7 Not specified
CNA Bytecodealliance Wasmtime affected >= 49.0.0, < 49.0.4 Not specified

References

ReferenceSourceLinkTags
github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8c... [email protected] github.com
github.com/bytecodealliance/wasmtime/pull/14826 [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4 [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17... [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937... [email protected] github.com
github.com/bytecodealliance/wasmtime/pull/14820 [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19 [email protected] github.com
github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de077... [email protected] github.com
github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7 [email protected] github.com
github.com/bytecodealliance/wasmtime/pull/14818 [email protected] github.com
github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-... [email protected] github.com
github.com/bytecodealliance/wasmtime/pull/14819 [email protected] github.com
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