---
title: "CVE-2026-53873: PickleScan's profile.run blocklist mismatch allows exec() bypass"
url: https://erroneo.us/security/cve/CVE-2026-53873/
description: "CVE-2026-53873 (picklescan (PyPI)): picklescan before 1.0.4 contains an incomplete blocklist for the profile module that fails to block the module-level…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-17
date_modified: 2026-06-18
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-53873"
kev: false
cvss: 9.3
epss: 0.00671
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-53873: PickleScan's profile.run blocklist mismatch allows exec() bypass

**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 0.7% , percentile 51: FIRST’s model estimates a 0.7% chance of exploitation activity in the next 30 days, higher than 51% 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 contains an incomplete blocklist for the profile module that fails to block the module-level profile.run() function, allowing attackers to achieve arbitrary code execution via exec(). Attackers can craft malicious pickle files calling profile.run(statement) to execute arbitrary Python code while picklescan reports zero security issues.

## 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): 0.67% probability of exploitation activity in the next 30 days; percentile 51.

## Sources

- [GHSA Advisory GHSA-7wx9-6375-f5wh](https://github.com/mmaitre314/picklescan/security/advisories/GHSA-7wx9-6375-f5wh)
- [GitHub Advisory GHSA-7wx9-6375-f5wh](https://github.com/advisories/GHSA-7wx9-6375-f5wh)
- [CVE.org record CVE-2026-53873](https://www.cve.org/CVERecord?id=CVE-2026-53873)
- [NVD entry CVE-2026-53873](https://nvd.nist.gov/vuln/detail/CVE-2026-53873)
- [VulnCheck Advisory: picklescan - Arbitrary Code Execution via profile.run() Blocklist Bypass](https://www.vulncheck.com/advisories/picklescan-arbitrary-code-execution-via-profile-run-blocklist-bypass)

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Source page: https://erroneo.us/security/cve/CVE-2026-53873/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt