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      <title>BREW-cabal-install-HSEC-2025-0005 — cabal-install dependency confusion</title>
      <link>https://cve.radiocsirt.org/vuln/brew-cabal-install-hsec-2025-0005</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Homebrew: cabal-install&lt;/p&gt;
&lt;p&gt;# `cabal-install` dependency confusion&lt;/p&gt;
&lt;p&gt;For **cabal-install &amp;lt; 3.4.0.0** and where multiple repositories are
configured, the resolver picks the highest available version across
all repositories.  Where a package is only defined in a private
repository, this behaviour leads to a [*dependency confusion*][blog]
supply chain vulnerability.  If the private package name becomes
known, a malicious actor can claim the name in the public repository
and publish a malicious version at a higher version number.&lt;/p&gt;
&lt;p&gt;Default `cabal-install` configurations that only use the
`hackage.haskell.org` repository are not affected.  Configurations
that use curated private repositories **exclusively** are also not
affected.&lt;/p&gt;
&lt;p&gt;[blog]: https://frasertweedale.github.io/blog-fp/posts/2021-02-12-haskell-dependency-confusion.html&lt;/p&gt;
&lt;p&gt;## Mitigations&lt;/p&gt;
&lt;p&gt;*cabal-install* version **3.4.0.0** and higher provide an `override`
option in the repository configuration.  It marks the associated
repository as canonical for all packages defined in that repository.
No other repositories will be considered.  For example:&lt;/p&gt;
&lt;p&gt;```
-- For packages in repo.example.com,
-- only versions in repo.example.com are considered
active-repositories:
  , hackage.haskell.org
  , repo.example.com:override
```&lt;/p&gt;
&lt;p&gt;Users and organisations using private repositories that contain
private packages in addition to public repositories **MUST** use the
`override` option to prevent dependency confusion attacks.&lt;/p&gt;
&lt;p&gt;Alternatively, projects and organisations can run…&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; Homebrew: cabal-install&lt;/p&gt;
&lt;p&gt;# `cabal-install` dependency confusion&lt;/p&gt;
&lt;p&gt;For **cabal-install &amp;lt; 3.4.0.0** and where multiple repositories are
configured, the resolver picks the highest available version across
all repositories.  Where a package is only defined in a private
repository, this behaviour leads to a [*dependency confusion*][blog]
supply chain vulnerability.  If the private package name becomes
known, a malicious actor can claim the name in the public repository
and publish a malicious version at a higher version number.&lt;/p&gt;
&lt;p&gt;Default `cabal-install` configurations that only use the
`hackage.haskell.org` repository are not affected.  Configurations
that use curated private repositories **exclusively** are also not
affected.&lt;/p&gt;
&lt;p&gt;[blog]: https://frasertweedale.github.io/blog-fp/posts/2021-02-12-haskell-dependency-confusion.html&lt;/p&gt;
&lt;p&gt;## Mitigations&lt;/p&gt;
&lt;p&gt;*cabal-install* version **3.4.0.0** and higher provide an `override`
option in the repository configuration.  It marks the associated
repository as canonical for all packages defined in that repository.
No other repositories will be considered.  For example:&lt;/p&gt;
&lt;p&gt;```
-- For packages in repo.example.com,
-- only versions in repo.example.com are considered
active-repositories:
  , hackage.haskell.org
  , repo.example.com:override
```&lt;/p&gt;
&lt;p&gt;Users and organisations using private repositories that contain
private packages in addition to public repositories **MUST** use the
`override` option to prevent dependency confusion attacks.&lt;/p&gt;
&lt;p&gt;Alternatively, projects and organisations can run…&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/brew-cabal-install-hsec-2025-0005</guid>
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