Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
picklescan versions before 1.0.1 are vulnerable to arbitrary file creation. An unauthenticated attacker who can get the application to deserialize untrusted pickle data can chain the logging.FileHandler class to bypass RCE-focused blocklists and create empty files in arbitrary locations, which could be used to disrupt the application or cause denial of service. Existing files are not overwritten or modified. Upgrade to picklescan 1.0.1 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 |
|---|---|---|---|---|
| 6.9 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N | CNA (VulnCheck) |
- CISA KEV Not listed.
- EPSS 0.0044, the 38th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 20 Jun 2026, 15:24 UTC Confirmed by the CVE List
- 31 Oct 2026, 14:42 UTC First seen by agentprime
- 31 Oct 2026, 14:42 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-m7j5-r2p5-c39r
- OSV: GHSA-m7j5-r2p5-c39r
- github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r
- github.com/mmaitre314/picklescan/pull/60
- github.com/mmaitre314/picklescan/commit/4d9bc9cd34bca8672dad3481cd4556d5ba747156
- github.com/mmaitre314/picklescan
- github.com/mmaitre314/picklescan/releases/tag/v1.0.1
- github.com/pypa/advisory-database/tree/main/vulns/picklescan/PYSEC-2026-225.yaml
- www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-filehandler-deserialization