---
id: CVE-2026-108555
title: >-
  PairDrop through 1.11.2 contains an IP spoofing vulnerability in Peer._setIP
  that allows remote attackers to join other networks' discovery rooms by
  supplying a forged cf-connecting-ip header
summary: >-
  PairDrop through 1.11.2 contains an IP spoofing vulnerability in Peer._setIP
  that allows remote attackers to join other networks' discovery rooms by
  supplying a forged cf-connecting-ip header. Attackers who know a victim's
  public IP can …
severity: medium
cvss: 4.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'
cwe:
  - CWE-348
published: '2026-10-10'
updated: '2026-10-10'
sourceUpdated: '2026-10-10T15:16:58.690'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-108555'
references:
  - url: 'https://github.com/schlagmichdoch/PairDrop'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/schlagmichdoch/PairDrop/blob/4862ba3067be1a0f2e0d1e94861dc9200b5bfeea/server/peer.js#L44-L54
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/schlagmichdoch/PairDrop/blob/4862ba3067be1a0f2e0d1e94861dc9200b5bfeea/server/ws-server.js#L312-L314
    label: disclosure@vulncheck.com
  - url: 'https://github.com/schlagmichdoch/PairDrop/issues/510'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/pairdrop-through-1.11.2-ip-spoofing-via-cf-connecting-ip-header
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-10T15:25:58.089Z'
---

## Overview

PairDrop through 1.11.2 contains an IP spoofing vulnerability in Peer._setIP that allows remote attackers to join other networks' discovery rooms by supplying a forged cf-connecting-ip header. Attackers who know a victim's public IP can appear as a local device on self-hosted instances not behind Cloudflare to send or receive files.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.