CVE-2026-25632Critical· 10.0▾ AbyssalPoC availableEPyT-Flow vulnerable to unsafe JSON deserialization (__type__)
▾ Abyssal zone — Critical with a public exploit or in-the-wild use
impact 55 · likelihood 0.2 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Oct 27.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.8%
1 GitHub repo (last check)
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.
EPyT-Flow has been patched in 0.16.1 -- affects all versions <= 0.16.0
Do not load any JSON from untrusted sources and do not expose the REST API.
EPyT-Flow thanks Jarrett Chan (@syphonetic) for detecting and reporting the bug.
epyt-flow < 0.16.1Upgrade to a patched release:
epyt-flow 0.16.1Connected by shared product, vendor, weakness, or advisory.
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