CVE-2022-35507: Proxmox Mail Gateway

High severity, CVSS 7.1. EPSS: 1.5% chance of exploitation in the next 30 days.

A response-header CRLF injection vulnerability in the Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) web interface allows a remote attacker to set cookies for a victim's browser that are longer than the server expects, causing a client-side DoS. This affects Chromium-based browsers because they allow injection of response headers with %0d. This is fixed in pve-http-server 4.1-3.

Affected products

• Proxmox Proxmox Mail Gateway: affected versions not specified
• Proxmox Pve HTTP Server: before 4.1-3 (fixed in 4.1-3)
• Proxmox Virtual Environment: affected versions not specified

Published 2022-12-04. Last modified 2026-06-17.