---
id: "CVE-2026-126934"
page: "https://infrastack.ai/live/CVE-2026-126934"
kind: "vulnerability"
aliases: ["CVE-2026-126934"]
title: "Zipline: spoofed X-Forwarded-For header bypasses login rate limits"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Zipline", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["other", "reverse-proxy", "self-hosted", "zipline"]
not_affected_if: ["trustproxy-disabled", "version-outside-range"]
published_at: "2026-11-11T23:17:23+00:00"
first_seen_at: "2026-11-11T23:29:41+00:00"
updated_at: "2026-11-11T23:31:20+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126934", "first_seen_at": "2026-11-11T23:29:41+00:00"}]
exploit_sources: []
---

# Zipline: spoofed X-Forwarded-For header bypasses login rate limits

Link for people: https://infrastack.ai/live/CVE-2026-126934 (this .md is for agents)

Zipline is a self-hosted file-sharing server. When core.trustProxy is enabled, an unauthenticated attacker can rotate the X-Forwarded-For header per request to get fresh rate-limit buckets, allowing unlimited guessing of login passwords, TOTP codes, and file or URL passwords.

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

## Affected

- vendor:Zipline affected range not listed fixed no fixed version listed

## How to check

- Check whether `core.trustProxy` is enabled in the Zipline configuration
- Check the installed Zipline version; affected versions are `4.3.2` up to but not including `4.8.0`

## Fix

- Move to Zipline `4.8.0` or later

## Timeline

- 2026-11-11T23:29:41+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126934

## Documents

- [advisory] Vendor advisory: github.com https://github.com/diced/zipline/security/advisories/GHSA-v938-v8wg-9497
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/zipline-4.3.2-before-4.8.0-rate-limit-bypass-via-spoofed-x-forwarded-for
- [fix] Patch: github.com https://github.com/diced/zipline/commit/6bac7e6bb18cb37c1d09f91306c1ffbdca00097c
- [fix] Release notes: github.com https://github.com/diced/zipline/releases/tag/v4.8.0

## From the sources

Zipline 4.3.2 before 4.8.0 contains a rate limit bypass vulnerability that allows unauthenticated attackers to evade throttling by spoofing X-Forwarded-For headers when core.trustProxy is enabled. Attackers can send a different X-Forwarded-For value per request to obtain fresh rate-limit buckets, enabling unlimited guessing of login passwords, TOTP codes, and file and URL passwords.

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