CVE-2026-25632 — EPyT-Flow has unsafe JSON deserialization (type)

Affected: WaterFutures EPyT-Flow

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.

GHSA-74vm-8frp-7w68 — EPyT-Flow vulnerable to unsafe JSON deserialization (type)

Affected: PyPI: epyt-flow

### Impact 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.

### Patches EPyT-Flow has been patched in 0.16.1 -- affects all versions <= 0.16.0

### Workarounds Do not load any JSON from untrusted sources and do not expose the REST API.

### Credits EPyT-Flow thanks Jarrett Chan (@syphonetic) for detecting and reporting the bug.

Most recent entries from all

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

GHSA-74vm-8frp-7w68 — EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)

CVE-2026-25632 — EPyT-Flow has unsafe JSON deserialization (type)

GHSA-74vm-8frp-7w68 — EPyT-Flow vulnerable to unsafe JSON deserialization (type)