Versioned security assessment

Report ID: SA-62E2A730

7/5/2026, 9:11:17 PM

ponyflash security assessment v3

Skill Security Certification Report

Audit History
Audit model: codex Historical report
Skill name
ponyflash
Version
v3
Maintainer
ponyflash
Source
github.com/ponyflash/ponyflash-skill/tree/main/
Coverage
33 Files scanned · 5,103 Lines analyzed
Policy version
Unavailable

Highest confirmed finding severity

Medium

1 confirmed security finding requires attention.

Installation context

Historical evidence

This report may not describe the currently installable artifact. Open the current Skill page for install guidance.

Open current Skill page

This report does not block or authorize the manifest or ZIP.

Most static findings are false positives from Markdown code formatting, installation paths, FFmpeg command examples, and safely quoted helper scripts. I confirmed only the active font download URL assignments as low-risk network behavior and added a medium semantic finding for missing font integrity verification. No prompt injection text or malicious intent was found.

Report position

Historical report

Open audit history before using this report to install.

Audit attestation

Not attestable

The required immutable binding is incomplete.

Human verification

Not verified

No human verification is recorded for this report.

Coverage

33 Files scanned · 5,103 Lines analyzed

3 items shown for review

Limitations

This report does not claim runtime or sandbox execution and does not prove the absence of side effects.

Evidence chain

Follow the evidence from source binding to the install contract. Available evidence supports verification; it is not a safety guarantee.

  1. Source

    Binding unavailable

  2. Artifact

    Identity incomplete

  3. Audit

    Complete

  4. Install contract

    Open manifest to verify

    Open manifest

Capabilities observed

Observed means this report recorded supporting evidence. Not recorded does not prove that a capability is absent.

Contains scripts

May execute code included with the Skill.

Observed in 1 evidence location

Network access

May connect to external services.

Observed in 19 evidence locations

Filesystem access

May read or write local files.

Observed in 43 evidence locations

Env variables

May read values from the process environment.

Observed in 7 evidence locations

External commands

May invoke commands or programs outside the Skill.

Observed in 144 evidence locations

Capability review items (2)
Low
scripts/ensure_subtitle_fonts.sh:26
Hardcoded URL
primary_url="${PONYFLASH_NOTO_FONT_URL:-https://mirrors.aliyun.com/CTAN/fonts/notocjksc/NotoSansCJKs
This executable helper downloads a subtitle font from a fixed external HTTPS URL without checksum verification. The download is intended, but the retrieved binary is later used in subtitle rendering.
Low
scripts/ensure_subtitle_fonts.sh:27
Hardcoded URL
fallback_url="https://cdn.jsdelivr.net/gh/notofonts/noto-cjk@main/Sans/OTF/SimplifiedChinese/NotoSan
This executable helper downloads a subtitle font from a fixed external HTTPS URL without checksum verification. The download is intended, but the retrieved binary is later used in subtitle rendering.

Risk findings

Confirmed security concerns are separated from items that still need review.

Confirmed security concerns (1)

RISK-001 Medium
scripts/ensure_subtitle_fonts.sh:23-27scripts/media_ops.sh:553-615
Unverified Runtime Font Download
The font preparation script downloads NotoSansCJKsc-Regular.otf from public HTTPS endpoints, allows PONYFLASH_NOTO_FONT_URL to override the primary source, and media_ops uses the downloaded font for subtitle burn-in. There is no checksum or signature verification before the binary font is handed to FFmpeg/libass.
The scripts clearly define network font URLs, an environment override, temporary font staging, and FFmpeg subtitle filter use. HTTPS is used, so the risk is supply-chain integrity rather than obvious malicious behavior.

Remediation

Suggested fixes recorded by this audit. Applying them is the maintainer’s responsibility.

  1. FIX-001
    Medium
    Unverified subtitle font downloads
    Pin the expected font artifact with a SHA-256 checksum or signature check before using it in FFmpeg subtitle rendering.
  2. FIX-002
    Low
    Overrideable runtime font source
    Restrict PONYFLASH_NOTO_FONT_URL to trusted HTTPS hosts or require explicit user confirmation before using a custom font URL.
  3. FIX-003
    Low
    API key handling guidance
    Recommend scoped or temporary PonyFlash keys and prefer existing environment variables over pasting long-lived keys into chat.

Expert evidence

Immutable subject identity, scanner metadata, dismissed matches, and source-level evidence.

Artifact subject

Marketplace commit
Unavailable
Content hash
Unavailable
Tree hash
Unavailable
Skill path
Unavailable
Audit payload hash
Unavailable

Analysis metadata

Audit model: codex

Analysis state: Complete

Scope is limited to the recorded files, lines, methods, and evidence. No runtime or sandbox execution is claimed.

Verify and export

JSON report CITATION.cff SARIF 2.1.0 Signed installation manifest

The manifest and lockfile bind install artifacts to cryptographic hashes. This integrity claim is separate from the security assessment.

Audit attestation: not_attestable