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CVE-2026-25632 — Vulnerability in epyt-flow — CVE Details

CRITICAL

EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)

Published February 4, 2026Updated June 29, 2026Source: osv

Summary

### 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.

Advisory Timeline

  • First published February 4, 2026 (250 days ago).
  • Last revised June 29, 2026 — 145 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

pip
Update epyt-flow to 0.16.1 or later
pip install "epyt-flow>=0.16.1"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: pypi (1).

PackageEcosystemAffectedFixed In
epyt-flow
pypi
0.1.0, 0.1.1, 0.10.0, 0.11.0 (+21 more)0.16.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-502
    Deserialization of Untrusted DataMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 10.0 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Frequently Asked Questions

What is CVE-2026-25632?
EPyT-Flow vulnerable to unsafe JSON deserialization (__type__) This vulnerability has been assigned a severity rating of CRITICAL (CVSS score: 10.0/10).
How do I check if my project is affected by CVE-2026-25632?
CVE-2026-25632 affects epyt-flow. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-25632 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
10.0

Exploitation is straightforward and causes maximum impact. Patch immediately.

Also Known As

GHSA-74vm-8frp-7w68
PYSEC-2026-330

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