Running brew outdated --greedy fails with Error: attempted to use a Downloadable without a URL!

[lafkpages]

Output of brew config

HOMEBREW_VERSION: 6.0.10-4-gfc5075e
ORIGIN: https://github.com/Homebrew/brew
HEAD: fc5075e5f0fcf9e19374745b3c5ba5a25bc8ccde
Last commit: 82 minutes ago
Branch: main
Core tap: N/A
Core cask tap: N/A
HOMEBREW_PREFIX: /opt/homebrew
HOMEBREW_CASK_OPTS: []
HOMEBREW_DOWNLOAD_CONCURRENCY: 24
HOMEBREW_EDITOR: code-wait
HOMEBREW_FORBID_PACKAGES_FROM_PATHS: set
HOMEBREW_MAKE_JOBS: 12
HOMEBREW_NO_ANALYTICS: set
HOMEBREW_REQUIRE_TAP_TRUST: set
Homebrew Ruby: 4.0.5 => /opt/homebrew/Library/Homebrew/vendor/portable-ruby/4.0.5_1/bin/ruby
CPU: dodeca-core 64-bit arm_lobos
Clang: 21.0.0 build 2100
Git: 2.55.0 => /opt/homebrew/bin/git
Curl: 8.7.1 => /usr/bin/curl
macOS: 26.5.2-arm64
CLT: 26.6.0.0.1781586589
Xcode: 26.6
Metal Toolchain: N/A
Rosetta 2: false

Output of brew doctor

Warning: Some installed casks are deprecated or disabled.
You should find replacements for the following casks:
  gstreamer-runtime
  rar
  wine-stable
  zap

Warning: Some installed kegs have no formulae!
This means they were either deleted or installed manually.
You should find replacements for the following formulae:
  ruby@2.7

Warning: Some installed formulae are deprecated or disabled.
You should find replacements for the following formulae:
  ruby@2.7

Warning: You have unlinked kegs in your Cellar.
Leaving kegs unlinked can lead to build-trouble and cause formulae that depend on
those kegs to fail to run properly once built. Run `brew link` on these:
  ruby

Warning: Some taps are not on the default git origin branch and may not receive
updates. If this is a surprise to you, check out the default branch with:
  git -C $(brew --repo macos-fuse-t/cask) checkout main

Warning: The following taps are not trusted:
  krishkrosh/apps
  macos-fuse-t/cask
  majd/repo
  mklement0/ttab
  nextdns/tap
  protonpass/tap
  waydabber/betterdisplay

Homebrew is currently ignoring formulae, casks and commands from these taps because tap trust is required.
Prefer trusting only the specific formulae, casks or commands you need.
Trust installed formulae from these taps with:
  brew trust --formula protonpass/tap/pass-cli
  brew trust --formula waydabber/betterdisplay/betterdisplaycli
Trust installed casks from these taps with:
  brew trust --cask krishkrosh/apps/trackweight
Trust other specific commands with:
  brew trust --command <user>/<tap>/<command>
Whole-tap trust is broader and includes all current and future formulae,
casks and commands from the listed taps. Trust whole taps with:
  brew trust krishkrosh/apps macos-fuse-t/cask majd/repo mklement0/ttab nextdns/tap protonpass/tap waydabber/betterdisplay
Untap them with:
  brew untap krishkrosh/apps macos-fuse-t/cask majd/repo mklement0/ttab nextdns/tap protonpass/tap waydabber/betterdisplay
To disable trust checks:
  export HOMEBREW_NO_REQUIRE_TAP_TRUST=1
This is not recommended and will be removed in a later release.
For more information, see:
  https://docs.brew.sh/Tap-Trust

Warning: /usr/bin occurs before /opt/homebrew/bin in your PATH.
This means that system-provided programs will be used instead of those
provided by Homebrew. Consider setting your PATH so that
/opt/homebrew/bin occurs before /usr/bin. Here is a one-liner:
  echo 'export PATH="/opt/homebrew/bin:$PATH"' >> ~/.zshrc

The following tools exist at both paths:
  bundle
  bundler
  erb
  gem
  git
  git-receive-pack
  git-shell
  git-upload-archive
  git-upload-pack
  irb
  jq
  openssl
  pip3
  pp
  python3
  rake
  rdoc
  ri
  ruby
  tclsh
  wish

Warning: Some installed formulae or casks are missing dependencies.
You should `brew install` the missing dependencies:
  brew install icu4c@77

Run `brew missing` for more details.

Description of issue

Running brew outdated --greedy fails with the following output:

✔︎ JSON API packages.arm64_tahoe.jws.json             Downloaded   15.2MB/ 15.2MB
Error: attempted to use a `Downloadable` without a URL!
/opt/homebrew/Library/Homebrew/downloadable.rb:134:in 'Downloadable#downloader'
/opt/homebrew/Library/Homebrew/cask/download.rb:65:in 'Cask::Download#fetch'
/opt/homebrew/Library/Homebrew/cask/installer.rb:282:in 'Cask::Installer#download'
/opt/homebrew/Library/Homebrew/cask/cask.rb:371:in 'Cask::Cask#new_download_sha'
/opt/homebrew/Library/Homebrew/cask/cask.rb:382:in 'Cask::Cask#outdated_download_sha?'
/opt/homebrew/Library/Homebrew/cask/cask.rb:411:in 'Cask::Cask#outdated_version'
/opt/homebrew/Library/Homebrew/cask/cask.rb:398:in 'Cask::Cask#outdated?'
/opt/homebrew/Library/Homebrew/cmd/outdated.rb:264:in 'block in Homebrew::Cmd::Outdated#select_outdated'
/opt/homebrew/Library/Homebrew/cmd/outdated.rb:250:in 'Array#select'
/opt/homebrew/Library/Homebrew/cmd/outdated.rb:250:in 'Homebrew::Cmd::Outdated#select_outdated'
/opt/homebrew/Library/Homebrew/cmd/outdated.rb:243:in 'Homebrew::Cmd::Outdated#outdated_formulae_casks'
/opt/homebrew/Library/Homebrew/cmd/outdated.rb:84:in 'Homebrew::Cmd::Outdated#run'
/opt/homebrew/Library/Homebrew/brew.rb:121:in '<main>'
Please report this issue:
  https://docs.brew.sh/Troubleshooting

Running brew outdated however works fine.

[lafkpages]

Furthermore, running brew upgrade --greedy does seem to work but there are intermittent errors:

Warning: The following taps are not trusted:
  krishkrosh/apps
  macos-fuse-t/cask
  majd/repo
  mklement0/ttab
  nextdns/tap
  protonpass/tap
  waydabber/betterdisplay

Homebrew is currently ignoring formulae, casks and commands from these taps because tap trust is required.
Prefer trusting only the specific formulae, casks or commands you need.
Trust installed formulae from these taps with:
  brew trust --formula protonpass/tap/pass-cli
  brew trust --formula waydabber/betterdisplay/betterdisplaycli
Trust installed casks from these taps with:
  brew trust --cask krishkrosh/apps/trackweight
Trust other specific commands with:
  brew trust --command <user>/<tap>/<command>
Whole-tap trust is broader and includes all current and future formulae,
casks and commands from the listed taps. Trust whole taps with:
  brew trust krishkrosh/apps macos-fuse-t/cask majd/repo mklement0/ttab nextdns/tap protonpass/tap waydabber/betterdisplay
Untap them with:
  brew untap krishkrosh/apps macos-fuse-t/cask majd/repo mklement0/ttab nextdns/tap protonpass/tap waydabber/betterdisplay
To disable trust checks:
  export HOMEBREW_NO_REQUIRE_TAP_TRUST=1
This is not recommended and will be removed in a later release.
For more information, see:
  https://docs.brew.sh/Tap-Trust
==> Downloading bottle manifests
✔︎ Bottle Manifest pkgconf (3.0.1)                    Downloaded   20.0KB/ 20.0KB
Error: attempted to use a `Downloadable` without a URL!
==> Would upgrade 1 outdated package
pkgconf 2.5.1 -> 3.0.1 (187.6KB)
==> Do you want to proceed with the upgrade? [y/n]
==> Upgrading 1 outdated package:
pkgconf 2.5.1 -> 3.0.1 (187.6KB)
Error: attempted to use a `Downloadable` without a URL!
==> Fetching downloads for: pkgconf
✔︎ Bottle pkgconf (3.0.1)                             Downloaded  187.6KB/187.6KB
==> Upgrading pkgconf
  2.5.1 -> 3.0.1
==> Pouring pkgconf--3.0.1.arm64_tahoe.bottle.tar.gz
🍺  /opt/homebrew/Cellar/pkgconf/3.0.1: 35 files, 823.9KB
==> Running `brew cleanup pkgconf`...
Disable this behaviour by setting `HOMEBREW_NO_INSTALL_CLEANUP=1`.
Hide these hints with `HOMEBREW_NO_ENV_HINTS=1` (see `man brew`).
Removing: /opt/homebrew/Cellar/pkgconf/2.5.1... (28 files, 532.2KB)
Error: attempted to use a `Downloadable` without a URL!
==> Upgraded 1 outdated package
pkgconf 2.5.1 -> 3.0.1

[p-linnane]

Thanks for the report. Should be fixed by Homebrew/brew#23084.