GHSA-74VM-8FRP-7W68
Vulnerability from github – Published: 2026-02-04 20:34 – Updated: 2026-02-06 21:43
VLAI?
Summary
EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)
Details
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.
Severity ?
10.0 (Critical)
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "epyt-flow"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.16.1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"aliases": [
"CVE-2026-25632"
],
"database_specific": {
"cwe_ids": [
"CWE-502"
],
"github_reviewed": true,
"github_reviewed_at": "2026-02-04T20:34:28Z",
"nvd_published_at": "2026-02-06T21:16:18Z",
"severity": "CRITICAL"
},
"details": "### Impact\nEPyT-Flow\u2019s 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.",
"id": "GHSA-74vm-8frp-7w68",
"modified": "2026-02-06T21:43:49Z",
"published": "2026-02-04T20:34:28Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/WaterFutures/EPyT-Flow/security/advisories/GHSA-74vm-8frp-7w68"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25632"
},
{
"type": "WEB",
"url": "https://github.com/WaterFutures/EPyT-Flow/commit/3fff9151494c7dbc72073830b734f0a7e550e385"
},
{
"type": "PACKAGE",
"url": "https://github.com/WaterFutures/EPyT-Flow"
},
{
"type": "WEB",
"url": "https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
],
"summary": "EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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