Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The mcp-run-python package, versions up to and including 0.0.22, has a Deno sandbox misconfiguration that grants network access to the host's localhost interface. An attacker who can get malicious Python code executed through the tool can send HTTP requests to internal services on the host. No fixed version is listed, and the project is archived, so users should stop using it or move to an execution environment that blocks access to loopback addresses.
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 |
|---|---|---|---|---|
| 5.8 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L | CNA (JFROG) |
- CISA KEV Not listed.
- EPSS 0.0019, the 8th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:01 UTC First seen by agentprime
- 31 Oct 2026, 15:01 UTC Confirmed by OSV