CVE-2026-86540

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    CVE-2026-86540

    Published: 7 Sept 2026Last Modified: 12 Sept 2026

    Summary: knowns before 0.30.0 Arbitrary Code Execution via LSP Binary

    Details: knowns versions before 0.30.0 fail to validate the settings.lsp.languages binary field in project configuration files, allowing attackers to execute arbitrary binaries by crafting a malicious .knowns/config.json file. When a repository with a crafted configuration is opened, the unvalidated binary path is executed twice under the user's account without any verification.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86540.json, https://github.com/knowns-dev/knowns/releases/tag/v0.30.0, https://github.com/knowns-dev/knowns/security/advisories/GHSA-mc52-mwq4-vfx3, https://nvd.nist.gov/vuln/detail/CVE-2026-86540, https://www.vulncheck.com/advisories/knowns-before-0.30.0-arbitrary-code-execution-via-lsp-binary, https://github.com/knowns-dev/knowns/commit/d3989829fb5095666d23d005b2f78a082832a396, https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/lsp/detect.go#L128-L157, https://github.com/knowns-dev/knowns/blob/v0.29.1/internal/models/config.go#L205-L216

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -cead30b2c3a34f66c0c40cb692ed51e588e63bd7

    Affected versions

    v0.29.1
    v0.29.0

    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-2026-86540 | CVE-DB