x16-prompt

MEDIUM

maintainer bcc 0 votes scanned 2026-09-17 00:27:14.276658

View on AUR

Why flagged

The PKGBUILD downloads a prebuilt AppImage binary from download.16x.engineer, which is the vendor's own distribution host for this proprietary AI coding tool (16x Engineer/16x Prompt). The host is not a well-known, widely-audited mirror, but it is the official vendor download endpoint matching the product URL (prompt.16x.engineer). More critically, the sha256sums entry contains '6df64a6d219a93080f0fc06e81c7de00' which is a 32-character MD5 hash, not a SHA-256 hash (which should be 64 hex characters). This means the integrity check is effectively broken/wrong — sha256sums with an MD5-length value will cause makepkg to fail or silently not verify correctly. The AppImage is installed as an executable binary at /opt/x16-prompt/16x-prompt and symlinked into /usr/local/bin, so it runs with user privileges. The combination of: (1) a prebuilt closed-source binary from a personal/small-vendor host, (2) a malformed/incorrect checksum that provides no real integrity guarantee, constitutes a genuine medium supply-chain risk — if the host is compromised or serves a different binary, there is no effective verification. This is not clearly malicious but is a real concern.

Triggered rules

Medium source=() URL on a non-standard host source_untrusted_domain

One or more source=() URLs point to a host outside the trusted allowlist (github.com, gitlab.com, codeberg.org, pypi.org, …).

PKGBUILD:13 source=("${_appimage_name}::https://download.16x.engineer/16x+Prompt-${pkgver}.AppImage")

Medium AI review llm_review

An AI model (anthropic/claude-4.6-sonnet-20260217) reviewed this and agrees it is MEDIUM (confidence 82%): The PKGBUILD downloads a prebuilt AppImage binary from download.16x.engineer, which is the vendor's own distribution host for this proprietary AI coding tool (16x Engineer/16x Prompt). The host is not a well-known, widely-audited mirror, but it is the official vendor download endpoint matching the product URL (prompt.16x.engineer). More critically, the sha256sums entry contains '6df64a6d219a93080f0fc06e81c7de00' which is a 32-character MD5 hash, not a SHA-256 hash (which should be 64 hex characters). This means the integrity check is effectively broken/wrong — sha256sums with an MD5-length value will cause makepkg to fail or silently not verify correctly. The AppImage is installed as an executable binary at /opt/x16-prompt/16x-prompt and symlinked into /usr/local/bin, so it runs with user privileges. The combination of: (1) a prebuilt closed-source binary from a personal/small-vendor host, (2) a malformed/incorrect checksum that provides no real integrity guarantee, constitutes a genuine medium supply-chain risk — if the host is compromised or serves a different binary, there is no effective verification. This is not clearly malicious but is a real concern.

PKGBUILD

1 offending line(s) highlighted

      1# Maintainer: Ben Copeland <ben@copeland.me.uk>
    
      2pkgname=x16-prompt
    
      3pkgver=0.0.138
    
      4pkgrel=1
    
      5pkgdesc="16x Prompt (AppImage version) - an AI coding tool by 16x Engineer"
    
      6arch=('x86_64')
    
      7url="https://prompt.16x.engineer/"
    
      8license=('unknown')
    
      9depends=('zlib' 'hicolor-icon-theme')
    
      10options=(!strip)
    
      11
    
      12_appimage_name="16x+Prompt-${pkgver}.AppImage"
    
      13source=("${_appimage_name}::https://download.16x.engineer/16x+Prompt-${pkgver}.AppImage")
    
      14sha256sums=('6df64a6d219a93080f0fc06e81c7de00')
    
      15
    
      16package() {
    
      17  install -d "${pkgdir}/opt/${pkgname}"
    
      18
    
      19  install -Dm755 "${srcdir}/${_appimage_name}" "${pkgdir}/opt/${pkgname}/16x-prompt"
    
      20
    
      21  install -d "${pkgdir}/usr/local/bin"
    
      22  ln -s "/opt/${pkgname}/16x-prompt" "${pkgdir}/usr/local/bin/16x-prompt"
    
      23
    
      24  install -d "${pkgdir}/usr/share/applications"
    
      25  cat <<EOF > "${pkgdir}/usr/share/applications/${pkgname}.desktop"
    
      26[Desktop Entry]
    
      27Name=16x Prompt
    
      28Comment=${pkgdesc}
    
      29Exec=/opt/${pkgname}/16x-prompt %U
    
      30Terminal=false
    
      31Type=Application
    
      32Icon=16x-prompt
    
      33Categories=Development;Utility;
    
      34StartupNotify=true
    
      35EOF
    
      36
    
      37}
    
      38

Scan history

Scanned at (UTC)	Severity	Rules
2026-09-17 00:27:14	Medium	2
2026-09-16 00:03:17	Medium	2
2026-09-15 00:25:31	Medium	2
2026-09-14 00:27:57	Medium	2
2026-09-13 00:19:54	Medium	2
2026-09-12 00:25:17	Medium	2
2026-09-11 00:19:22	Medium	2
2026-09-10 00:22:44	Medium	2
2026-09-09 00:04:09	Medium	2
2026-09-08 00:18:08	Medium	2
2026-09-07 00:30:15	Medium	2
2026-09-06 00:17:06	Medium	2
2026-09-05 00:16:27	Medium	2
2026-09-04 00:03:13	Medium	2
2026-09-03 00:15:47	Medium	2
2026-09-02 00:02:31	Medium	2
2026-09-01 00:11:19	Medium	2
2026-08-31 00:19:57	Medium	2
2026-08-30 00:04:14	Medium	2
2026-08-29 00:29:17	Medium	2