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

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-17 · updated 2026-10-26
Weakness: CWE-183

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 products

picklescan: before 1.0.4 — fixed in 1.0.4

How to fix

Upgrade to a fixed version: picklescan 1.0.4. Check the vendor advisory for mitigations.

References

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-vvpj-8cmc-gx39
https://www.vulncheck.com/advisories/picklescan-universal-blocklist-bypass-via-pkgutil-resolve-name
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-vvpj-8cmc-gx39

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