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CVE PROGRAM SOURCE RECORD5.4 Medium

CVE-2026-97209

Insecure temporary file in mix deps.partition lets a local user execute code in another user's dependency build

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Status
Published
Published
Updated
Assigning organization
EEF

Description

Insecure Temporary File vulnerability in Mix deps.partition in Elixir allows a local user to execute code as another user via a swapped partition config file. Partitioned dependency compilation passes the project configuration to each partition VM through a file in a fixed-name directory under the shared system temporary directory, and the partition trusts what it reads back. Another local user on the same host can exploit this during a mix deps.compile run that uses partitioned compilation. Mix.Tasks.Deps.Partition.server/4 in lib/mix/lib/mix/tasks/deps.partition.ex creates the directory with File.mkdir_p/1, which accepts an existing directory without checking its owner, so a user who created it first can replace the file before client/0 reads it. This issue affects mix: from 1.20.0-rc.4 before 1.20.5.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

elixir-lang elixir

Default version status: unaffected

  • 1.20.0-rc.4 to < 1.20.5affected
pkg:otp/mix?repository_url=https:%2F%2Fgithub.com%2Felixir-lang%2Felixir&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Felixir-lang%2Felixir.git

elixir-lang elixir

Default version status: unaffected

  • 7f3d95b60c28ae3026a5c1bf943166391245bfd1 to < *affected
pkg:github/elixir-lang/elixir

References