---
id: CVE-2026-77087
title: >-
  Paperclip before 0.3.1 in default local_trusted mode fails to validate Host
  headers, allowing attackers to execute arbitrary commands via DNS rebinding
summary: >-
  Paperclip before 0.3.1 in default local_trusted mode fails to validate Host
  headers, allowing attackers to execute arbitrary commands via DNS rebinding.
  An attacker can craft a malicious webpage that, when visited by a developer
  running …
severity: critical
cvss: 9.6
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'
cwe:
  - CWE-862
published: '2026-08-21'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T20:06:30.133'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-77087'
references:
  - url: >-
      https://github.com/paperclipai/paperclip/security/advisories/GHSA-x8hx-rhr2-9rf7
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/paperclip-before-remote-code-execution-via-dns-rebinding
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/paperclipai/paperclip/security/advisories/GHSA-x8hx-rhr2-9rf7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00572
epssPercentile: 0.44883
ingestedAt: '2026-09-24T20:51:40.215Z'
---

## Overview

Paperclip before 0.3.1 in default local_trusted mode fails to validate Host headers, allowing attackers to execute arbitrary commands via DNS rebinding. An attacker can craft a malicious webpage that, when visited by a developer running Paperclip locally, uses DNS rebinding to make authenticated API requests and execute commands through the process adapter.

## Remediation

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