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CVE-2026-25632: EPyT-Flow has unsafe JSON deserialization (__type__)

• Severity: critical (CVSS 10.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-06 · updated 2026-06-17
• Weakness: CWE-502

Description

EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water distribution networks. Prior to 0.16.1, EPyT-Flow’s REST API parses attacker-controlled JSON request bodies using a custom deserializer (my_load_from_json) that supports a type field. When type is present, the deserializer dynamically imports an attacker-specified module/class and instantiates it with attacker-supplied arguments. This allows invoking dangerous classes such as subprocess.Popen, which can lead to OS command execution during JSON parsing. This also affects the loading of JSON files. This vulnerability is fixed in 0.16.1.

Affected products

• WaterFutures EPyT-Flow: before 0.16.1 — fixed in 0.16.1

How to fix

Upgrade to a fixed version: WaterFutures EPyT-Flow 0.16.1. Check the vendor advisory for mitigations.

References

• https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385
• https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1
• https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68

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