CVE-2026-25632
CWE-502Published: February 6, 2026· Updated: Jun 17, 2026
Official 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.
Risk Analysis
EPyT-Flow contains a critical vulnerability in its JSON deserializer that allows for arbitrary OS command execution by dynamically importing malicious modules. This flaw is rated with a maximum CVSS score of 10.0, indicating extreme risk.
No public exploit is known, and the vulnerability is not in the KEV catalog. It is remotely exploitable with low attack complexity.
Upgrade EPyT-Flow to version 0.16.1 or later to secure the deserialization process.
Technical Analysis
CVE-2026-25632 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 10.0.
The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.
From a weakness classification perspective (CWE-502): Insecure deserialization vulnerabilities allow attackers to inject malicious objects during deserialization, potentially enabling remote code execution.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (3)
Quick Facts
Related CVEs (CWE-502)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-25632 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts