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Advisory record · GHSA-74vm-8frp-7w68

EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)

CVSS 10.0 CriticalCriticalEPSS 0.0080 · 56th percentile

Critical, because:

  • CVSS score 10.0: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 4 Feb 2026, 20:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
epyt-flowPyPI<0.16.10.16.1
Identifiers
GHSA-74vm-8frp-7w68 · CVE-2026-25632 · PYSEC-2026-330
Weakness (CWE)
CWE-502
Tags
Published
4 Feb 2026
Updated
27 Oct 2026

Machine-written summary

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

EPyT-Flow, a Python package, is vulnerable to unsafe JSON deserialization in versions before 0.16.1. Its REST API and JSON file loading use a custom deserializer that dynamically imports and instantiates attacker-specified classes when a __type__ field is present, which the source says can lead to OS command execution during parsing. The source does not state what access an attacker needs beyond supplying crafted JSON. Upgrade to epyt-flow 0.16.1, which contains the fix; until then, the source advises not loading JSON from untrusted sources and not exposing the REST API.

Written 31 Oct 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

ScoreRatingCVSSVectorSource
10.0 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0080, the 56th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:07 UTC First seen by agentprime
  2. 31 Oct 2026, 14:07 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.