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VulnerabilityPublished

CVE-2026-97209: elixir · DEPRECATED: Insecure Temporary File

Affects elixirSource CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium : upgrade to 1.20.5 when convenient.

Data as of 30 Oct 2026, 17:18 UTC

CVSS 4.0 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (EEF)CVSS 4.05.4
Patch
Available – fixed in 1.20.5
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

What to do

Upgrade elixir and mix to 1.20.5.

Affected software

ProductAffectedFixed in
elixirmixAffected
  • >=1.20.0-rc.4 <1.20.5
Fixed in
  • 1.20.5
elixirelixir-lang/elixirAffected
  • ≥ 7f3d95b60c28ae3026a5c1bf943166391245bfd1, < 55eb91220a1de14dc5aa27029d1f45b0f5832b2d
Fixed in–
GitHubmixpkg:github/mixOther threatsAffected
  • >=1.20.0-rc.4 <1.20.5
Fixed in
  • 1.20.5

CPE configurations (1)

  • cpe:2.3:a:elixir-lang:elixir:*:*:*:*:*:*:*:*

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

This vulnerability is fixed in Elixir version 1.20.5. Users should upgrade to version 1.20.5 or later to remediate this issue. No additional mitigation steps are required once the upgrade is applied.

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.

References

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