GHSA-97f8-7cmv-76j2: picklescan (CVE-2026-53875)

Package	Ecosystem	Affected	Fixed in
picklescan	PyPI	<1.0.3	1.0.3

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The picklescan package before 1.0.3 can be bypassed when its scan_pytorch function checks a PyTorch file. A crafted PyTorch file can hide its magic number from the scanner's opcode check through a dynamic eval call in a reduce hook, so the scanner misses it while PyTorch still loads the value. An attacker who can get a victim to load such a file may achieve arbitrary code execution. Upgrade picklescan to version 1.0.3 or later. The source gives few details on the exact crafting steps.

Written 6 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.1	High	4.0	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0055, the 46th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:01 UTC First seen by agentprime
31 Oct 2026, 15:01 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.