How severe is GHSA-4x5p-f36r-mxxr?

GHSA-4x5p-f36r-mxxr has a CVSS score of 7/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-4x5p-f36r-mxxr?

GHSA-4x5p-f36r-mxxr affects the following packages: mlflow (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-4x5p-f36r-mxxr?

Update mlflow to 3.4.0rc0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4x5p-f36r-mxxr is resolved across your whole dependency graph.

How do I detect GHSA-4x5p-f36r-mxxr in my PyPI dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mlflow. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

How do I mitigate GHSA-4x5p-f36r-mxxr if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

How does O3 Security protect against GHSA-4x5p-f36r-mxxr?

O3 pinpoints whether GHSA-4x5p-f36r-mxxr is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Is GHSA-4x5p-f36r-mxxr actively exploited in the wild?

No public exploit code has been indexed for GHSA-4x5p-f36r-mxxr yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-4x5p-f36r-mxxr?

GHSA-4x5p-f36r-mxxr has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 12th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-4x5p-f36r-mxxr?

GHSA-4x5p-f36r-mxxr is classified as CWE-379 (CWE-379). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-4x5p-f36r-mxxr published, and has it been updated?

GHSA-4x5p-f36r-mxxr was published on February 2, 2026 and was last updated on April 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

GHSA-4x5p-f36r-mxxr

HIGH

mlflow Creates of Temporary File in Directory with Insecure Permissions

Also known asBIT-mlflow-2025-10279CVE-2025-10279

Published

Feb 2, 2026

Updated

Apr 17, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk12th percentile+0.21%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

1 pkg affected

🐍mlflow

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.

Description

In mlflow version 2.20.3, the temporary directory used for creating Python virtual environments is assigned insecure world-writable permissions (0o777). This vulnerability allows an attacker with write access to the /tmp directory to exploit a race condition and overwrite .py files in the virtual environment, leading to arbitrary code execution. The issue is resolved in version 3.4.0.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`mlflow`	all versions	3.4.0rc0

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for mlflow. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update mlflow to 3.4.0rc0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-4x5p-f36r-mxxr is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-4x5p-f36r-mxxr is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-4x5p-f36r-mxxr. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

In mlflow version 2.20.3, the temporary directory used for creating Python virtual environments is assigned insecure world-writable permissions (0o777). This vulnerability allows an attacker with write access to the `/tmp` directory to exploit a race condition and overwrite `.py` files in the virtual environment, leading to arbitrary code execution. The issue is resolved in version 3.4.0.

O3 Security · Impact-Aware SCA

Is GHSA-4x5p-f36r-mxxr in your dependencies?

O3 detects GHSA-4x5p-f36r-mxxr across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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