Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Tthe mlflow package, versions from 1.26.0 before 3.11.0, creates some temporary directories with overly open permissions, letting local users modify model artifacts. An attacker with local access could tamper with those artifacts so that loading them via cloudpickle runs arbitrary code. Upgrade to mlflow 3.11.0 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.0 | High | 3.0 | CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA (@huntr_ai) |
- CISA KEV Not listed.
- EPSS 0.0019, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:39 UTC First seen by agentprime
- 31 Oct 2026, 14:39 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-f2m9-wcf4-cwwx
- OSV: GHSA-f2m9-wcf4-cwwx
- nvd.nist.gov/vuln/detail/CVE-2026-4137
- github.com/mlflow/mlflow/commit/1dcbb0c2fbd1f446c328830e601ca13a28219b8a
- github.com/mlflow/mlflow/commit/bd8854fb2b4b168a4384ebddc6c4a0b5d56aff01
- github.com/advisories/GHSA-4x5p-f36r-mxxr
- github.com/mlflow/mlflow
- github.com/pypa/advisory-database/tree/main/vulns/mlflow/PYSEC-2026-2655.yaml
- huntr.com/bounties/648dc30b-76c7-4433-86b8-f43d926fd8d6