{"id":"CVE-2026-25632","aliases":["EUVD-2026-5576","GHSA-74vm-8frp-7w68","PYSEC-2026-330"],"status":"published","title":"EPyT-Flow has unsafe JSON deserialization (__type__)","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.","severity":{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00795,"percentile":0.56897,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"cwes":["CWE-502"],"published":"2026-02-04T20:34:28Z","modified":"2026-10-28T02:30:35Z","exploits":[{"source":"pocgithub","id":"lazarus0x1337/CVE-2026-25632","title":"lazarus0x1337/CVE-2026-25632","date":"2026-07-21","url":"https://github.com/lazarus0x1337/CVE-2026-25632"}],"fixes":[{"ecosystem":"PyPI","package":"epyt-flow","fixed_in":["0.16.1"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"epyt-flow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.1"}]}]},{"source":"osv","ecosystem":"PyPI","package":"epyt-flow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.1"}]}],"versions":["0.1.0","0.1.1","0.10.0","0.11.0","0.12.0","0.13.0","0.13.1","0.14.0","0.14.1","0.14.2","0.15.0","0.15.0b1","0.16.0","0.2.0","0.3.0","0.4.0","0.5.0","0.6.0","0.7.0","0.7.1","0.7.2","0.7.3","0.8.0","0.8.1","0.9.0"]},{"source":"osv","ecosystem":"PyPI","package":"epyt-flow","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.16.1"}]}],"versions":["0.1.0","0.1.1","0.10.0","0.11.0","0.12.0","0.13.0","0.13.1","0.14.0","0.14.1","0.14.2","0.15.0","0.15.0b1","0.16.0","0.2.0","0.3.0","0.4.0","0.5.0","0.6.0","0.7.0","0.7.1","0.7.2","0.7.3","0.8.0","0.8.1","0.9.0"]}],"products":[{"vendor":"waterfutures","product":"epyt-flow"}],"references":[{"url":"https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory","web"]},{"url":"https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1","tags":["x_refsource_MISC","Product","Release Notes","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25632","tags":["advisory"]},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/epyt-flow/PYSEC-2026-330.yaml","tags":["web"]},{"url":"https://pypi.org/project/epyt-flow","tags":["web","package"]},{"url":"https://github.com/advisories/GHSA-74vm-8frp-7w68","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25632.json","tags":["advisory"]},{"url":"https://github.com/WaterFutures/EPyT-Flow","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-25632","title":"EPyT-Flow has unsafe JSON deserialization (__type__)","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.","status":"published","published":"2026-02-06T20:24:18.213Z","modified":"2026-02-06T20:56:43.719Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T13:41:30.911526Z"}],"euvd":[{"id":"EUVD-2026-5576","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.","status":"published","published":"2026-02-06T20:24:18Z","modified":"2026-02-06T20:56:43Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T19:48:42.836553Z"}],"ghsa":[{"id":"GHSA-74vm-8frp-7w68","title":"EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)","description":"### Impact\nEPyT-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.\n\n### Patches\nEPyT-Flow  has been patched in 0.16.1 -- affects all versions \u003c= 0.16.0\n\n### Workarounds\nDo not load any JSON from untrusted sources and do not expose the REST API.\n\n### Credits\nEPyT-Flow  thanks Jarrett Chan (@syphonetic) for detecting and reporting the bug.","status":"published","published":"2026-02-04T20:34:28Z","modified":"2026-10-27T16:23:40Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:41:37.912288Z"}],"nvd":[{"id":"CVE-2026-25632","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.","status":"published","published":"2026-02-06T21:16:18.377Z","modified":"2026-06-17T10:24:58.957Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"secondary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:05.52517Z"}],"osv":[{"id":"CVE-2026-25632","title":"EPyT-Flow has unsafe JSON deserialization (__type__)","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.","status":"published","published":"2026-02-06T20:24:18.213Z","modified":"2026-10-28T02:30:35.879722194Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:44:59.438965Z"},{"id":"GHSA-74vm-8frp-7w68","title":"EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)","description":"### Impact\nEPyT-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.\n\n### Patches\nEPyT-Flow  has been patched in 0.16.1 -- affects all versions \u003c= 0.16.0\n\n### Workarounds\nDo not load any JSON from untrusted sources and do not expose the REST API.\n\n### Credits\nEPyT-Flow  thanks Jarrett Chan (@syphonetic) for detecting and reporting the bug.","status":"published","published":"2026-02-04T20:34:28Z","modified":"2026-10-27T16:30:07.245251191Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:40.657155Z"},{"id":"PYSEC-2026-330","title":"EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)","description":"### Impact\nEPyT-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.\n\n### Patches\nEPyT-Flow  has been patched in 0.16.1 -- affects all versions \u003c= 0.16.0\n\n### Workarounds\n Do not load any JSON from untrusted sources and do not expose the REST API.\n\n ### Credits\nEPyT-Flow  thanks Jarrett Chan (@syphonetic) for detecting and reporting the bug.","status":"published","published":"2026-06-29T11:50:50.959788Z","modified":"2026-07-01T20:22:52.406443Z","cvss":[{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:52:56.847083Z"}]}}