Vulnerability · Published Jun 17, 2026 · Assigned by VulnCheck

CVE-2026-3490picklescan - Universal Blocklist Bypass via pkgutil.resolve_name

Critical 10.0

In plain English

A critical-severity security flaw in picklescan from picklescan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.8% (higher than 58% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)10.0Critical

Exploit odds (30 days)0.8%top 42.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

picklescan before 1.0.4 fails to block pkgutil.resolve_name, allowing attackers to bypass the entire blocklist by resolving any dangerous function through indirect REDUCE calls. Remote attackers can invoke any blocked function such as os.system, builtins.exec, or subprocess.call to achieve remote code execution.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
PyPI	picklescan	1.0.4	GHSA-vvpj-8cmc-gx39
PyPI	picklescan	1.0.4	PYSEC-2026-456

Affected products (as reported)

Vendor	Product	Versions
picklescan	picklescan	0 – before 1.0.4

Weakness: CWE-183 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

GHSA Advisory GHSA-vvpj-8cmc-gx39 vendor-advisory
VulnCheck Advisory: picklescan - Universal Blocklist Bypass via pkgutil.resolve_name third-party-advisory