CVE-2026-119135

    Dashboard / Vulnerabilities / CVE-2026-119135

    CVE-2026-119135

    Published: 29 Oct 2026Last Modified: 5 Nov 2026

    Summary: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 Panic via StreamReader Type Mismatch

    Details: Wasmtime 46.0.0 before 48.0.6 and 49.0.0 before 49.0.3 panics when the host reads a component model stream as a different Rust item type than it was created with, because the host-to-host read path asserts matching TypeIds instead of returning an error. Guest code can return a host-created StreamReader<U> that the embedder reads as StreamReader<T>, where both types map to the same component model type, crashing the embedding process.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119135.json, https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-63h4-6cx9-pjfj, https://nvd.nist.gov/vuln/detail/CVE-2026-119135, https://www.vulncheck.com/advisories/wasmtime-46.0.0-before-48.0.6-and-49.0.0-before-49.0.3-panic-via-streamreader-type-mismatch

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 423be7a4e4d30bb377c836d317521d1eb874e157
    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-2026-119135 | CVE-DB