Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Penelope (penelope-shell-handler on PyPI, versions before 0.20.0) extracts tar archives from remote sessions without validating member paths in the Unix download path. A malicious or compromised remote session that returns a crafted tar archive can write files outside the intended download directory, limited to what the operator's user can write, and in some cases this may be chained to code execution. Upgrade to penelope-shell-handler 0.20.0 or later, which rejects unsafe archive paths.
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 |
|---|---|---|---|---|
| 5.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0037, the 31st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:41 UTC First seen by agentprime
- 31 Oct 2026, 14:41 UTC Confirmed by OSV