---
title: "CVE-2026-56315: PickleScan has multiple stdlib modules with direct RCE not in blocklist"
url: https://erroneo.us/security/cve/CVE-2026-56315/
description: "CVE-2026-56315 (picklescan (PyPI)): picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, osxsupport…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-23
date_modified: 2026-09-25
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-56315"
kev: false
cvss: 9.3
epss: 0.01147
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-56315: PickleScan has multiple stdlib modules with direct RCE not in blocklist

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 1.1% , percentile 66: FIRST’s model estimates a 1.1% chance of exploitation activity in the next 30 days, higher than 66% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes picklescan (PyPI) < 1.0.4, fixed in 1.0.4 . Check your lockfile, including transitive dependencies.

## What it is

picklescan before 1.0.4 fails to block at least seven Python standard library modules (including uuid, osxsupport, aixsupport, pyrepl.pager, and imaplib) exposing eight functions that provide direct arbitrary command execution. Attackers can craft malicious pickle files importing these unblocked modules to achieve remote code execution while bypassing picklescan's safety validation entirely.

## Affected packages

- PyPI `picklescan` < 1.0.4 → fixed: 1.0.4

## Affected products (CVE record)

- picklescan picklescan: < 1.0.4

## Severity

- VulnCheck CVSS 4.0: 9.3 `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`
- VulnCheck CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.15% probability of exploitation activity in the next 30 days; percentile 66.

## Sources

- [GitHub Security Advisory (GHSA-g38g-8gr9-h9xp)](https://github.com/mmaitre314/picklescan/security/advisories/GHSA-g38g-8gr9-h9xp)
- [GitHub Advisory GHSA-g38g-8gr9-h9xp](https://github.com/advisories/GHSA-g38g-8gr9-h9xp)
- [CVE.org record CVE-2026-56315](https://www.cve.org/CVERecord?id=CVE-2026-56315)
- [NVD entry CVE-2026-56315](https://nvd.nist.gov/vuln/detail/CVE-2026-56315)
- [VulnCheck Advisory: picklescan - Remote Code Execution via Unblocked Standard Library Modules](https://www.vulncheck.com/advisories/picklescan-remote-code-execution-via-unblocked-standard-library-modules)
- [github.com](https://github.com/mmaitre314/picklescan/commit/bf26452ae2e3204429762c2bb1aa9eacd40436bb)

---
Source page: https://erroneo.us/security/cve/CVE-2026-56315/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt