PYSEC-2026-330
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/epyt-flow/PYSEC-2026-330.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2026-330
- Aliases
- Published
- 2026-06-29T11:50:50.959788Z
- Modified
- 2026-07-01T20:22:52.406443Z
- Severity
-
- 10.0 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
- 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 (myloadfrom_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.
- References
-
- 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
- https://github.com/WaterFutures/EPyT-Flow
- https://github.com/WaterFutures/EPyT-Flow/releases/tag/v0.16.1
- https://pypi.org/project/epyt-flow
- https://github.com/advisories/GHSA-74vm-8frp-7w68
Affected packages
PyPI / epyt-flow
Package
- Name
- epyt-flow
- View open source insights on deps.dev
- Purl
- pkg:pypi/epyt-flow
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed0.16.1