What is CVE-2026-56304?

CVE-2026-56304 is a medium-severity vulnerability in Mmaitre314 Picklescan, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-06-20.

How severe is CVE-2026-56304?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Deserialization in Mmaitre314 Picklescan

CVE-2026-56304

picklescan before 1.0.1 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to create arbitrary zero-byte files via logging.FileHandler class instantiation. Attackers can exploit this by crafting malicious pickle payloads to bypass RCE blocklists and create lock files or other filesystem artifacts, potentially causing denial of service or application disruption.

Vulnerability class: Insecure Deserialization

Published 2026-06-20 · last modified 2026-06-24.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.004 (36.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Mmaitre314 Picklescan
Picklescan — versions 0, 1.0.1

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

github.com/mmaitre314/picklescan/security/advisories/GHSA-m7j5-r2p5-c39r (Exploit, vendor-advisory, Vendor Advisory)
www.vulncheck.com/advisories/picklescan-arbitrary-file-creation-via-logging-fil… (Third Party Advisory, third-party-advisory)

Frequently asked questions

What is CVE-2026-56304?: CVE-2026-56304 is a medium-severity vulnerability in Mmaitre314 Picklescan, classified under Deserialization of Untrusted Data. CVSS score: 6.5/10. Published 2026-06-20.
How severe is CVE-2026-56304?: Medium severity. CVSS v3 base score is 6.5 out of 10.