CVE-2026-25632
EPyT-Flow is a Python package designed for the easy generation of hydraulic and water quality scenario data of water distribution networks.
Impact
### 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | epyt-flow | < 0.16.1 | 0.16.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Waterfutures | Epyt-Flow | before 0.16.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-74vm-8frp-7w68
- https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68
- https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385
- https://nvd.nist.gov/vuln/detail/CVE-2026-25632
- https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1
- https://github.com/pypa/advisory-database/tree/main/vulns/epyt-flow/PYSEC-2026-330.yaml
- https://pypi.org/project/epyt-flow