CVE-2026-97209: Insecure temporary file in mix deps.partition lets a local user execute code in another user's dependency build
Noroxi assessment
Priority: Monitor (action score 21/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No special conditions are required; it is repeatable.
- Fixed version: elixir-lang elixir 1.20.5, 55eb91220a1de14dc5aa27029d1f45b0f5832b2d, 9adbe955c8664f4be77d879dd38c003dd39fa777.
Low priority for now. Upgrade to elixir-lang elixir 1.20.5, 55eb91220a1de14dc5aa27029d1f45b0f5832b2d, 9adbe955c8664f4be77d879dd38c003dd39fa777 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Oct 30, 2026
- Updated
- Oct 30, 2026
- EPSS
- 0.1% · 1th percentile
- CWE
- CWE-377
Report tools
Action score
21
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.4 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- proof of concept
- Automatable
- no
- Technical impact
- total
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- —
- CNA · EEF
- 5.4
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.
elixir-lang elixir
- 1.20.0-rc.4 and later · before 1.20.5affected · semver
- 7f3d95b60c28ae3026a5c1bf943166391245bfd1 and lateraffected · gitfixed in 55eb91220a1de14dc5aa27029d1f45b0f5832b2d, 9adbe955c8664f4be77d879dd38c003dd39fa777
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:14 | elixir-lang | from 0 | — |
Same product
elixir-lang: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-115274Unbounded integer parsing in JSON.decode/1 enables CPU and memory exhaustion denial of service in Elixir27Monitor
- CVE-2026-109821Unbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir25Monitor
- CVE-2026-75758Unbounded recursion between Inspect.List charlist rendering and List.to_string/1 error path in Elixir23Monitor
Published before and after this one in the same product
- ← EarlierCVE-2026-49762Jun 9, 2026 · Unbounded integer parsing in the Version module enables CPU and memory exhaustion denial of service20Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| elixir-lang elixir | 1.20.5 | Vendor (CNA) |
| elixir-lang elixir | 55eb91220a1de14dc5aa27029d1f45b0f5832b2d | Vendor (CNA) |
| elixir-lang elixir | 9adbe955c8664f4be77d879dd38c003dd39fa777 | Vendor (CNA) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
- Published
- Fix recordedsame day
- TodayNov 2, 2026+3 d
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- Quinn Wiltonfinder
- José Valimremediation developer
- Jonatan Männchen / EEFcoordinator
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- Integrity
- Availability
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- P
Weakness class (CWE)
CWE-377 · Insecure Temporary FileCVSS vector
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
cna
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- SSVC exploitation— → poc
- Exploit maturity— → none
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (5 more)Show less
- cna.erlef.org/cves/CVE-2026-97209.html
- osv.dev/vulnerability/EEF-CVE-2026-97209
- github.com/elixir-lang/elixir/commit/7f3d95b60c28ae3026a5c1bf943166391245bfd1
- github.com/elixir-lang/elixir/commit/55eb91220a1de14dc5aa27029d1f45b0f5832b2d
- github.com/elixir-lang/elixir/commit/9adbe955c8664f4be77d879dd38c003dd39fa777
Vendor advisories and official records. Exploit/PoC links are deliberately left out.