CVE-2026-76893

    Dashboard / Vulnerabilities / CVE-2026-76893

    CVE-2026-76893

    Published: 4 Nov 2026Last Modified: 8 Nov 2026

    Summary: tsParticles: A single anonymous MCP session can monopolize HTTP mode and deny new clients

    Details: tsParticles is a TypeScript library for creating highly customizable particle animations. Prior to 4.3.2, the HTTP mode of @tsparticles/mcp-server reuses one stateful StreamableHTTPServerTransport for every client. An unauthenticated client that sends the first initialize request without an mcp-session-id claims the shared transport state, causing later independent clients to receive Server already initialized and preventing them from establishing sessions until the process restarts. The first client's session remains functional. This issue is fixed in version 4.3.2.

    References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76893.json, https://github.com/tsparticles/tsparticles/security/advisories/GHSA-h7c4-q426-7jh9, https://nvd.nist.gov/vuln/detail/CVE-2026-76893, https://github.com/tsparticles/tsparticles/commit/d3b5672bd61bb847abfa21193c34eabf7aba6896, https://github.com/tsparticles/tsparticles/pull/5888

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -527bc42f2324fbb9b93262efa3d90a5517532b8b

    Affected versions

    v4.3.1
    v4.3.0

    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-2026-76893 | CVE-DB