---
id: CVE-2026-102354
title: BentoPDF is a privacy-focused PDF toolkit that runs in the browser
summary: >-
  BentoPDF is a privacy-focused PDF toolkit that runs in the browser. In
  versions through 2.8.6, cloudflare/cors-proxy-worker.js performs a
  DNS-over-HTTPS safety check in hostnameResolvesToPrivate(), as used by
  isValidCertificateUrl() and …
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-367
  - CWE-918
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:17:05.007'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102354'
references:
  - url: >-
      https://github.com/alam00000/bentopdf/commit/45496fcd2ed6e02dcdde0d3839cc5024c091760c
    label: security-advisories@github.com
  - url: >-
      https://github.com/alam00000/bentopdf/commit/58cd1a8893bfe06e4a59a72adc2e7db00a8b9266
    label: security-advisories@github.com
  - url: 'https://github.com/alam00000/bentopdf/releases/tag/v2.8.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/alam00000/bentopdf/security/advisories/GHSA-wh78-rcw2-hhg9
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-14T19:49:57.602Z'
---

## Overview

BentoPDF is a privacy-focused PDF toolkit that runs in the browser. In versions through 2.8.6, cloudflare/cors-proxy-worker.js performs a DNS-over-HTTPS safety check in hostnameResolvesToPrivate(), as used by isValidCertificateUrl() and isValidTsaUrl(), separately from the outbound fetch(targetUrl, ...). In deployments where PROXY_SECRET validation is not enabled, a direct client that controls authoritative DNS can forge the Origin header, supply a certificate, OCSP, CRL, or TSA URL that passes the proxy's accepted path checks, return a public address during validation, and return a private or link-local address during the later fetch. The endpoint can return allowed response bodies to the attacker, but exploitation requires precise timing, redirects and IP-literal obfuscation are blocked, and network reachability limits the target. This vulnerability is fixed in 2.8.7.

## Remediation

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