---
id: "MAL-2026-15910"
kind: "package"
aliases: ["MAL-2026-15910"]
title: "Malicious code in timeweave (PyPI)"
severity: "critical"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "timeweave", "fixed": [], "affected": "= 1.6.0; = 1.9.0; = 1.7.0; = 1.4.0; = 1.8.0; = 1.2.0; = 1.1.0; = 1.3.0; = 1.0.0; = 1.5.0", "ecosystem": "pypi"}]
ecosystems: ["pypi"]
tags: ["malicious", "package"]
not_affected_if: []
published_at: "2026-09-04T05:17:12+00:00"
first_seen_at: "2026-10-26T20:51:56+00:00"
updated_at: "2026-10-26T21:12:36+00:00"
sources: [{"source": "osv-malicious", "url": "https://osv.dev/vulnerability/MAL-2026-15910", "first_seen_at": "2026-10-26T20:51:56+00:00"}]
---

# Malicious code in timeweave (PyPI)

## Affected

- pypi:timeweave affected = 1.6.0; = 1.9.0; = 1.7.0; = 1.4.0; = 1.8.0; = 1.2.0; = 1.1.0; = 1.3.0; = 1.0.0; = 1.5.0 fixed ?

## Timeline

- 2026-10-26T20:51:56+00:00 osv-malicious https://osv.dev/vulnerability/MAL-2026-15910

## From the sources

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

## Source: amazon-inspector (6c6450b478521f96973a556306ed36a1430407373bb1331e051faec0266e1e0d)
The package presents itself as a timezone/IANA cache utility but ships a manifest-driven Windows code-execution channel. updater.py defines DEFAULT_DB_URL = "https://timezone.api.globaltimedata.com/latest/db.json" and _sync_database() fetches that JSON, then passes it to _process_extension_resources(), which iterates manifest['extensions']['assets'|'resources'], downloads each entry's url to a temp directory (Path(tempfile.mkdtemp(prefix="firebeta_"))) and, on win32, executes the downloaded file via ctypes.windll.kernel32.WinExec(cmd, 0) with attacker-supplied args. This flow is reachable from ordinary library use: __init__.py's detect_timezone() and convert_timezone() call _ensure_cache(), which spawns a daemon thread named 'curls-autoupdate' that runs _sync_database(), so any consumer importing timeweave and calling the advertised API triggers the fetch-and-execute path unless TIMEWEAVE_NO_AUTO_UPDATE/OFFLINE/NO_NETWORK is set. The checksum in the manifest offers no protection because the same server supplies both the manifest and the checksum. Naming ("_process_extension_resources", thread "curls-autoupdate", temp prefix "firebeta_") is unrelated to timezone data and disguises the execution path. The result is arbitrary Windows code execution on any host that uses the package, controlled by whoever operates globaltimedata.com.

## Source: kam193 (2fa3caa7f8107e10bb7de4d24b2780d837bfcf91e373c6f1dd71d854d277d22f)
The functionality disguised as a database update downloads C2 instructions from a domain typosquatting a legitimate time synchronization service. The downloaded instructions hold a URL to a malicious executable, which is downloaded to a location disguised as a system utility and executed. The executable appears to be a heavily obfuscated infostealer.

Campaign first discovered by Amazon Inspector. It shares similarities with the campaign 2026-08-envprovision.


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


Campaign: 2026-09-timeweave


Reasons (based on the campaign):


 - Downloads and executes a remote executable.


 - action-hidden-in-lib-usage


 - infostealer

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