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Response snapshot Oct 27, 2026, 17:26 UTC

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VulnerabilityCVE-2026-25632

EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)

EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)

At a glance

Exploited
Not known
Severity
10.0 Critical (CVSS 3.1)
Chance of exploitation
Not estimated
Sources
1 source

What to do

GitHub lists first patched versions: epyt-flow: 0.16.1. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-74vm-8frp-7w68 (opens a new tab)

What happened

### 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.

Continue reading

Affected package ranges reported by GitHub: epyt-flow: < 0.16.1

Scores and how they were measured

CVSS base severity

10.0

Version 3.1As of

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

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

Not available

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-74vm-8frp-7w68 (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-74vm-8frp-7w68, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 27). EPyT-Flow vulnerable to unsafe JSON deserialization (__type__) (CVE-2026-25632). https://kevwire.com/record/CVE-2026-25632

MLA

"EPyT-Flow vulnerable to unsafe JSON deserialization (__type__) (CVE-2026-25632)." KEVWire, 27 Oct. 2026, kevwire.com/record/CVE-2026-25632.

Chicago

KEVWire. "EPyT-Flow vulnerable to unsafe JSON deserialization (__type__) (CVE-2026-25632)." Last modified October 27, 2026. https://kevwire.com/record/CVE-2026-25632.

Evidence summary (plain text)

EPyT-Flow vulnerable to unsafe JSON deserialization (__type__) (Feb 4, 2026).
EPyT-Flow vulnerable to unsafe JSON deserialization (__type__)
CVSS 10.0 (version 3.1; evidence as of Oct 27, 2026; https://github.com/advisories/GHSA-74vm-8frp-7w68).
Sources:
GitHub-reviewed advisory GHSA-74vm-8frp-7w68: https://github.com/advisories/GHSA-74vm-8frp-7w68
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc
Record ID: CVE-2026-25632.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 27, 2026, 17:25 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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Record details

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