Critical

EPyT-Flow has unsafe JSON deserialization (type)

Type: advisorySources: OSV

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.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-25632
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 13:41 UTC · Revision 1

Source evidence

EPyT-Flow has unsafe JSON deserialization (type)

core-osv · Original source

Published 6 Feb 2026, 20:24 UTC

osv:CVE-2026-25632

Complete source record

{
  "id": "d0474d694efeb86b6eb21cb0252558be288ea016485c32b02d83a59acb1d612f",
  "url": "https://osv.dev/vulnerability/CVE-2026-25632",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "EPyT-Flow has unsafe JSON deserialization (__type__)",
    "summary": "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.",
    "evidence": "osv:CVE-2026-25632",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-25632",
      "aliases": [
        "CVE-2026-25632",
        "GHSA-74vm-8frp-7w68",
        "PYSEC-2026-330"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/waterfutures/epyt-flow",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "af8507dc7560e4c8275085149bccd779bda2526f"
                },
                {
                  "fixed": "3fff9151494c7dbc72073830b734f0a7e550e385"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:waterfutures:epyt-flow:*:*:*:*:*:python:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.16.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3fff9151494c7dbc72073830b734f0a7e550e385"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "af8507dc7560e4c8275085149bccd779bda2526f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v0.16.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.15.0",
            "v0.14.2",
            "v0.14.1",
            "v0.8.0",
            "v0.7.3",
            "v0.7.2",
            "v0.7.1",
            "v0.7.0",
            "v0.6.0",
            "v0.5.0",
            "v0.4.0",
            "v0.3.0",
            "v0.2.0",
            "v0.1.1",
            "v0.1.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-25632.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:35.879722194Z",
      "provider": "osv",
      "references": [
        "https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25632.json",
        "https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25632",
        "https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-502"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25632.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25632",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503223,
  "published_at": "2026-02-06T20:24:18.213+00:00"
}