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diivi/aseprite-mcp

diivi/aseprite-mcp vmain@a89b205

Security Trust Score
Grade F · Serious issues
Tier 1 · Public sourceHigh confidence · 98%
Declared MCP capabilities
ResourcesPrompts

This server scored F. Run it behind runtime policy enforcement so one bad tool call can't become an incident.

1 issue capping this score
  • criticalNo command-injection sinks — 1 occurrence
Reputation808stars83forks3open issues2d agolast commit2yage

Security controls

Deterministic, evidence-backed. Score earned from passing controls; a failed guard caps it.

Model–MCP Runtime Guardrails

  • Warn
    Strict JSON Schema Enforcementschemas not strict

    Tool inputs are constrained (additionalProperties:false), so unexpected arguments can't be smuggled in.

    Fix: Set additionalProperties:false and require explicit parameters on every tool.

  • Pass
    Indirect Prompt Injection (IPI) Defensesguardno injection markers

    Tool/prompt/resource text is free of hidden instructions that could hijack the agent.

  • Pass
    In-Session Definition Integrityguardno call-gated or call-time tool definition changes

    Tool and prompt definitions stay fixed during a session — they don't change after a few calls, which is how runtime-gated rug-pulls slip past one-time review.

  • Pass
    User-in-the-Loop / Approval Scopeguardno destructive tool scope

    No over-broad or destructive tools (arbitrary shell, bulk-delete) that warrant human approval.

  • N/A
    Tool Definition Integrityguardno prior version to diff

    Every consecutive version pair is diffed for new injection markers or destructive scope — a risky diff anywhere in history is a rug-pull (fail, durable); benign description drift warns.

Application Security Checks

  • Fail
    No command-injection sinksguard1 occurrence

    Untrusted tool input reaching a shell yields remote code execution. How many servers fail this?

    aseprite_mcp/tools/preview.py:54

    Fix: Never pass tool arguments to a shell; use argv arrays with shell disabled.

  • Warn
    No known-vulnerable dependencies9 of 33 runtime deps vulnerable; worst critical

    Runtime dependencies (parsed from the lockfile) are scanned against OSV.dev for published CVEs. Advisory: flagged dependencies lower the score but don't hard-cap it, since transitive reachability is unproven.

    [email protected] — GHSA-5p39-cfhj-2xmp[email protected] — GHSA-82r6-8w77-94w6[email protected] — PYSEC-2026-4024[email protected] — PYSEC-2026-4025

    Fix: Upgrade the flagged dependencies past their fixed versions.

  • Warn
    Has a security policyno security policy

    A SECURITY.md gives a private path to report vulnerabilities.

    Fix: Add SECURITY.md with a disclosure contact and process.

  • Pass
    No dynamic code executionguardno sinks found

    eval()/exec()/Function() on tool-derived strings allows arbitrary code execution.

  • Pass
    No path traversalguardno sinks found

    Naive path checks let tools read/write outside intended directories (EscapeRoute-class).

  • Pass
    No SSRF sinksguardno sinks found

    Fetching tool-supplied URLs can pivot into internal networks and metadata services.

  • Pass
    No unsafe deserializationguardno sinks found

    pickle/yaml.load/etc. on untrusted data can execute code.

  • Pass
    No committed secretsguardno secrets found

    Hardcoded keys/tokens in published source are live credentials an attacker can use.

  • Pass
    Credentials sourced from environmentreads credentials from environment

    Reading secrets from env/secret stores avoids hardcoding them.

  • Pass
    Dependencies pinned (lockfile)lockfile present

    A lockfile makes installs reproducible and resistant to silent dependency swaps.

  • Pass
    Actively maintainedrecent commits

    Unmaintained servers don't receive security fixes.

  • Pass
    Repository not archivedguardactive

    Archived repositories will never be patched.

  • Pass
    Declares a licenseMIT

    A clear license is required for legal enterprise use.

  • Pass
    Adoption & popularityestablished adoption

    A small, capped nudge from stars/downloads — widely-used servers get more eyes on bugs. It can never offset a real security failure.

  • Not checked
    Signed releasesnot evaluated

    Signed releases let consumers verify artifacts weren't tampered with.

  • N/A
    No install/post-install scriptsguardno published package

    install hooks run arbitrary code on every consumer at install time.

  • N/A
    Package name not typosquattingguardno published package

    Names mimicking popular packages are a common malware delivery vector.

  • N/A
    Published with provenanceno published package

    Build provenance attests the artifact was built from the claimed source by CI.

  • N/A
    Established maintainerno published package

    Brand-new / single anonymous maintainers raise takeover and malware risk.

Transport & Trust Model

  • Pass
    Execution Sandboxingcontainerized

    A container/sandbox image limits blast radius; a server that runs natively has full host access.

  • Pass
    Network Exposureno bind-all detected

    Binding 0.0.0.0 or exposing debug inspectors widens the attack surface.

  • N/A
    Transport Encryption (TLS)guardno remote endpoints

    Plaintext HTTP exposes traffic and bearer tokens to interception.

  • N/A
    IAM / Authentication Scopingno remote endpoints

    OAuth 2.1 / Protected Resource Metadata gates who can invoke tools.

  • N/A
    No Token Passthroughguardno HTTP transport

    The client's token is never forwarded to downstream APIs — the server obtains its own, correctly-scoped credential instead.

  • N/A
    DNS-Rebinding Protectionno HTTP transport

    HTTP endpoints reject requests carrying an unlisted Origin, so a malicious web page can't drive the server through the user's browser.

  • N/A
    Live Endpoint Reachablenot dynamically scanned

    A dynamic scan connected to the declared remote endpoint and it responded — verified live, not a dead URL.

  • N/A
    Authentication Enforced (live)not dynamically scanned

    If the server declares auth is required, it must actually reject anonymous clients. Serving tools to unauthenticated callers is a real exposure.

Tools (80)

set_tagcopy_celadd_frameadd_groupadd_layerclear_celdraw_linedraw_pathdraw_rowsfill_areaset_frameset_layeradd_framesadjust_hslcopy_framecreate_celdelete_tagexport_tagget_boundscopy_spritedraw_circledraw_pixelslint_spriteoutline_celdelete_framedelete_layerdraw_iso_boxdraw_line_atdraw_polygonexport_framefill_area_atrename_layercreate_canvasexport_layersexport_spriteinvert_colorsreorder_layerreplace_colorcompare_framesdraw_circle_atdraw_pixels_atdraw_rectangleflatten_spriteoutline_nativepropagate_celsset_onion_skindraw_ellipse_atduplicate_layerextract_paletteget_color_statsget_sprite_infoset_cel_opacityexport_animationmerge_layer_downset_cel_positionadjust_hsl_nativeapply_convolutiondraw_rectangle_atrender_onion_skinset_layer_opacityexport_spritesheetset_frame_durationapply_gradient_recttween_cel_positionsapply_dither_patternoffset_cel_positionsset_layer_blend_modeset_layer_visibilityapply_dither_gradientduplicate_frame_rangeimport_image_as_layertween_cel_scale_easedset_frame_duration_alloscillate_cel_positionstween_cel_opacity_easedanimation_workflow_guidepropagate_frame_to_rangelist_convolution_matricestween_cel_positions_easedadjust_brightness_contrast