CVE-2026-119978

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    CVE-2026-119978

    Published: 30 Oct 2026Last Modified: 8 Nov 2026

    Summary: Flowise through 3.1.4 Custom Function Sandbox Escape RCE via LocalFileStore

    Details: Flowise through 3.1.4 contains a sandbox escape vulnerability that allows authenticated users to execute OS commands by abusing allowlisted langchain and mammoth modules when ALLOW_BUILTIN_DEP=true. Attackers can submit JavaScript to /api/v1/node-custom-function that writes a file into the mammoth package via LocalFileStore and requires it, escaping vm2 as the Flowise process user.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119978.json, https://github.com/advisories/GHSA-9gvv-qjj3-2p6g, https://nvd.nist.gov/vuln/detail/CVE-2026-119978, https://www.vulncheck.com/advisories/flowise-through-3.1.4-custom-function-sandbox-escape-rce-via-localfilestore, https://github.com/FlowiseAI/Flowise, https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L1733, https://github.com/FlowiseAI/Flowise/blob/a65f81bb43ef66d3ce734bf0dff4223ae8041c95/packages/components/src/utils.ts#L55-L114, https://github.com/soovwv/cve/blob/a37354aff1e78c0601772e7716f5318c473e8640/CVE-2026-119978.md

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    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-2026-119978 | CVE-DB