CVE-2026-53872: picklescan - Arbitrary File Read via Unsafe Pickle Deserialization

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-17 · updated 2026-06-17
Weakness: CWE-22

Description

picklescan before 0.0.35 contains an unsafe pickle deserialization vulnerability allowing unauthenticated attackers to read arbitrary server files by chaining io.FileIO and urllib.request.urlopen. Attackers can bypass RCE-focused blocklists to exfiltrate sensitive data like /etc/passwd to external servers.

Affected products

picklescan: before 0.0.35 — fixed in 0.0.35

How to fix

Upgrade to a fixed version: picklescan 0.0.35. Check the vendor advisory for mitigations.

References

https://github.com/mmaitre314/picklescan/security/advisories/GHSA-9726-w42j-3qjr
https://www.vulncheck.com/advisories/picklescan-arbitrary-file-read-via-unsafe-pickle-deserialization
https://github.com/mmaitre314/picklescan/security/advisories/GHSA-9726-w42j-3qjr

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