GHSA-mghf-wjfp-p5xm

    Dashboard / Vulnerabilities / GHSA-mghf-wjfp-p5xm

    GHSA-mghf-wjfp-p5xm

    Published: 28 Oct 2026Last Modified: 28 Oct 2026

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

    Details: ## Summary When running with the Cranelift compiler backend on an aarch64 target, Wasmtime can compile a Wasm module with more than ~256k targets on one `br_table` instruction in a way that results in an incorrect conditional branch target. This conditional branch could then jump to arbitrary other code (at an user-controlled offset), leading to arbitrary sandbox escapes. ## Impact Any Wasmtime engine running on aarch64 with default settings can be forced to jump to arbitrary code by a user-controlled Wasm module. All versions of Wasmtime/Cranelift that support aarch64, since the initial release of that support in 2020 (before Wasmtime v1.0), are affected. ## Patches Wasmtime v36.0.19, v48.0.7, and v49.0.4 have been released which all fix this issue.

    References: https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-mghf-wjfp-p5xm, https://nvd.nist.gov/vuln/detail/CVE-2026-115893, https://github.com/bytecodealliance/wasmtime/pull/14818, https://github.com/bytecodealliance/wasmtime/pull/14819, https://github.com/bytecodealliance/wasmtime/pull/14820, https://github.com/bytecodealliance/wasmtime/pull/14826, https://github.com/bytecodealliance/wasmtime/commit/222ff3a65dab9aa7011f8c246937751a0bac5abd, https://github.com/bytecodealliance/wasmtime/commit/994549891c8a706cb4f2809f9d17b9f67b31e618, https://github.com/bytecodealliance/wasmtime/commit/e61df1b454be9313d61a5f8de07722a421139bbe, https://github.com/bytecodealliance/wasmtime/commit/f517bd6e890c7c1291ab9fe05d8cc0c9f11e56aa, https://github.com/bytecodealliance/wasmtime, https://github.com/bytecodealliance/wasmtime/releases/tag/v36.0.19, https://github.com/bytecodealliance/wasmtime/releases/tag/v48.0.7, https://github.com/bytecodealliance/wasmtime/releases/tag/v49.0.4, https://rustsec.org/advisories/RUSTSEC-2026-0379.html

    Affected packages

    Package

    Name: wasmtime

    Purl: pkg:cargo/wasmtime

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -36.0.19

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-mghf-wjfp-p5xm | CVE-DB