---
id: "CVE-2025-71461"
page: "https://infrastack.ai/live/CVE-2025-71461"
kind: "vulnerability"
aliases: ["CVE-2025-71461"]
title: "Zipline: predictable upload filenames let attackers guess private files"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "zipline"]
not_affected_if: ["public-uploads-only", "single-user-instance"]
published_at: "2026-11-13T10:17:24+00:00"
first_seen_at: "2026-11-13T10:47:09+00:00"
updated_at: "2026-11-13T10:54:53+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-71461", "first_seen_at": "2026-11-13T10:47:09+00:00"}]
exploit_sources: []
---

# Zipline: predictable upload filenames let attackers guess private files

Link for people: https://infrastack.ai/live/CVE-2025-71461 (this .md is for agents)

Zipline before 4.0.2 generates upload filenames with Math.random, which can be reconstructed from five observed gfycat-style names. An attacker can then predict other users' upload filenames and reach private uploads until the instance restarts.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Zipline version in use; affected if below `4.0.2`
- Confirm whether the instance hosts private uploads for several users

## Fix

- Upgrade Zipline to `4.0.2` or later

## Timeline

- 2026-11-13T10:47:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-71461

## Documents

- [advisory] Vendor advisory: github.com https://github.com/diced/zipline/security/advisories/GHSA-6rg9-q9ww-w2rw
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/zipline-before-4.0.2-predictable-filenames-via-math-random-state-recovery

## From the sources

Zipline before 4.0.2 contains a predictable filename vulnerability that allows attackers to infer other users' upload filenames by recovering the Math.random generator state. Attackers with five consecutive gfycat-style filenames can reconstruct the random state to predict previous and future filenames until the instance restarts, exposing private uploads.

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_