CVE-2026-119133

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    CVE-2026-119133

    Published: 29 Oct 2026Last Modified: 31 Oct 2026

    Summary: Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Misaligned VMContext via Exception Tags

    Details: Wasmtime 47.0.0 before 48.0.6 and 49.0.0 before 49.0.3 contains a memory misalignment flaw in VMContext layout that causes undefined behavior when modules contain an odd number of exception tags. A WebAssembly module with an odd tag count misaligns subsequent host fields in embedders with exceptions enabled, although no exploitation path is currently known.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119133.json, https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-p79w-pv2r-29qp, https://nvd.nist.gov/vuln/detail/CVE-2026-119133, https://www.vulncheck.com/advisories/wasmtime-47.0.0-before-48.0.6-and-49.0.0-before-49.0.3-misaligned-vmcontext-via-exception-tags

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 39d67168cdb6911ffdc961381314b6fed62e3c93
    Fixed -72bc45bd197c46718df0c02b8d4cbc1cb610ab2d

    Affected versions

    v49.0.2
    v49.0.1
    v49.0.0

    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
    CVE-2026-119133 | CVE-DB