CVE-2026-97209: elixir · DEPRECATED: Insecure Temporary File
Affects elixirSource CVE Database V5
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
Thin evidence
One scorer or none| CNA (EEF) | CVSS 4.0 | 5.4 |
|---|
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 30 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| elixirmix | Affected
| Fixed in
|
| elixirelixir-lang/elixir | Affected
| Fixed in– |
GitHubmixpkg:github/mixOther threats | Affected
| Fixed in
|
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
- github.com/elixir-lang/elixir/security/advisories/GHSA-96q6-xhwp-fc8q (opens in a new tab)
- cna.erlef.org/cves/CVE-2026-97209.html (opens in a new tab)
- osv.dev/vulnerability/EEF-CVE-2026-97209 (opens in a new tab)
- github.com/elixir-lang/elixir/commit/7f3d95b60c28ae3026a5c1bf943166391245bfd1 (opens in a new tab)
- github.com/elixir-lang/elixir/commit/55eb91220a1de14dc5aa27029d1f45b0f5832b2d (opens in a new tab)
- github.com/elixir-lang/elixir/commit/9adbe955c8664f4be77d879dd38c003dd39fa777 (opens in a new tab)