---
id: "MAL-2026-14590"
kind: "package"
aliases: ["MAL-2026-14590"]
title: "Malicious code in yamlformatter-utils (PyPI)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "yamlformatter-utils", "fixed": [], "affected": "= 1.0.0", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-08-28T10:01:36+00:00"
first_seen_at: "2026-10-26T20:51:55+00:00"
updated_at: "2026-10-26T21:12:36+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-14590", "first_seen_at": "2026-10-26T20:51:55+00:00"}]
---

# Malicious code in yamlformatter-utils (PyPI)

## Affected

- pypi:yamlformatter-utils affected = 1.0.0 fixed ?

## Timeline

- 2026-10-26T20:51:55+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-14590

## From the sources

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_-= Per source details. Do not edit below this line.=-_

## Source: kam193 (ef2cbf7d7c360d11860ea9383a1ed84b491e75361f994359fd97284a5d25cdc2)
During import, the package collects sensitive information and exfiltrates it using DNS queries.


---

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.


Campaign: 2026-08-ekx-report-utils


Reasons (based on the campaign):


 - targetted-attack


 - exfiltration-generic


 - exfiltration-credentials

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_