Infinite loop in OctoPrint - CVE-2025-48879
Published: June 10, 2025 / Updated: November 9, 2026
Vulnerability identifier: #VU162904
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-48879
CWE-ID: CWE-835
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an unauthenticated adjacent-network attacker to make OctoPrint's web server unresponsive, denying access to its web interface.
The vulnerability exists due to an endless loop in OctoPrint's upload request handler when a malformed multipart/form-data request lacks a closing boundary. An unauthenticated adjacent-network attacker can send this request to an endpoint using the affected handler and block the entire web server without victim interaction.
Affected software
OctoPrint
How to mitigate CVE-2025-48879
Install security update from vendor's website.
OctoPrint - update to 1.11.2