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Vulnerability record · CVE-2026-25632 · published 6 February 2026

CVE-2026-25632: Waterfutures epyt-flow deserialization of untrusted data vulnerability

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.

10.0 CVSS 3.1 Critical EPSS 1.3% · top 31.4% CWE-502 · Deserialization of untrusted data
10.0CVSS 3.1 base score
1.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385 Patch
https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1 ProductRelease Notes
https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68 Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-25632), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.