---
id: "CVE-2026-126932"
page: "https://infrastack.ai/live/CVE-2026-126932"
kind: "vulnerability"
aliases: ["CVE-2026-126932"]
title: "Zipline: authenticated users bypass disabled MIME types via file metadata"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "zipline"]
not_affected_if: ["no-user-uploads", "version-4.8.0-or-later"]
published_at: "2026-11-11T23:17:22+00:00"
first_seen_at: "2026-11-11T23:29:41+00:00"
updated_at: "2026-11-11T23:31:23+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126932", "first_seen_at": "2026-11-11T23:29:41+00:00"}]
exploit_sources: []
---

# Zipline: authenticated users bypass disabled MIME types via file metadata

Link for people: https://infrastack.ai/live/CVE-2026-126932 (this .md is for agents)

Zipline 4.6.2 before 4.8.0 lets a logged-in user change a file's Content-Type through the file metadata API, even when the administrator has disabled that type. The attacker uploads a permitted file, then sets a disabled type such as text/html so the raw file endpoint serves it under that type.

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

## How to check

- Check the installed Zipline version; affected versions are 4.6.2 up to but not including `4.8.0`.
- Review whether administrators have disabled any MIME types in Zipline settings, since the bypass only matters when a disabled type is in use.

## Fix

- Zipline: upgrade to `4.8.0` or later.

## Timeline

- 2026-11-11T23:29:41+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126932

## Documents

- [advisory] Vendor advisory: github.com https://github.com/diced/zipline/security/advisories/GHSA-rgxm-54cf-whf7
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/zipline-4.6.2-before-4.8.0-disabled-mime-type-policy-bypass-via-file-metadata-update
- [fix] Patch: github.com https://github.com/diced/zipline/commit/fc8e886ca841b86a3f677cd7dac1bf9a5bd45b2c
- [fix] Release notes: github.com https://github.com/diced/zipline/releases/tag/v4.8.0

## From the sources

Zipline 4.6.2 before 4.8.0 contains a policy bypass vulnerability that allows authenticated users to evade administrator-disabled MIME types by editing file metadata. Attackers can upload a permitted file, then set a disabled type such as text/html through PATCH /api/user/files/:id so /raw/:id serves that Content-Type.

---

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